Jefferson Electric Transformer History (2022)

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Jefferson Electric Transformer History (1)


Jefferson Electric
Transformers

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Jefferson Electric Transformer History (2)

What's On This Page?

Introduction
Battery Converter
Toy Transformers
Directions for Toy Transformers
Luminous Tube transformers

Bell transformers
Control transformers
Powerformers
Fuses

Pages of Other Transformers from a 1928 Catalog with Pictures.

Jefferson Oil Burner Transformers

Jefferson Gaseous Tube Sign Transformers

Jefferson Universal Toy Transformers

Jefferson Electric Transformer History (3)

Introduction

Besides making clocks, Jefferson also made manydifferent kinds of transformers including toy (train) type, bell, radioreplacement, oil burner ignition, control, luminous tube sign, door bell,signal, auto and double wound. The Toy Transformers could also be used forChristmas tree lights. In addition to transformers, Jefferson also made outletand switch boxes, fuses, cutout bases and clips, and metal clad mercuryswitches.

It might seem strange that electricaltechnology was so far advanced for the 1910's and 1920's. Knowledge about coilproperties, metallurgy, insulating materials, etc. was commonly known. Thematerials may not have been as sophisticated as what we have today, but theprinciples were the same and the products worked very well.

Nikola Tesla was influential in standardizingthe frequency of power distribution systems to 60 cycles in the USA. Teslabased this frequency on the way we tell time. A frequency of 25 cycles had beencommon in some areas of the United States and Canada in the late 1920's to theearly 1930's. It was used because power apparatus, such as synchronousconverters and alternating-current commutator motors, work better at this lowerfrequency. However, at 25 cycles the flicker of lamps can be seen and isobjectionable. The advantage of the higher frequency is that transformersrequire less iron and copper making them less expensive and lighter in weight.

Some of the older Jefferson transformers werefor use with 25/40 cycle currents. Others were rated at 50/133 cycles.Fortunately, a 25/40-cycle transformer can be used safely with today's 60-cyclehouse current. About 1965, the term for line frequency was changed from cyclesto hertz (Hz).

Jefferson Electric Transformer History (4)

Battery Converter

Jefferson Electric Transformer History (5)

Jefferson Electric Transformer History (6)

Jefferson Electric Transformer History (7)

Toy Transformers

LITTLEJEFF--No. 535-101
50 watts capacity

Jefferson Electric Transformer History (8)Jefferson Electric Transformer History (9)JeffersonLittle Jeff Toy Transformer. This transformer delivers six secondary voltagesranging from 5-1/2 to 13 volts in 1-1/2 volt steps. It is recommended for allBing, Ives and Lionel "O" gauge outfits except No. 268 outfit.

A green emblem is painted under the nameLittle Jeff. The 7 position circular slider is at the front of the transformer.The line cord is made of two separate wires with black cloth on the outside.These are twisted together and exit the transformer case through a porcelaingrommet that says Jefferson 100 1. The other end has an old style plastictwo-prong plug

The transformer case is fastened to a squaredish shaped bottom plate at four raised points near the corners. The notestamped in the top says "100 to 120V. 50 to 133 CY."

The transformer case size is 2-3/8"H,3-1/2"W and 3-1/2"D. Size including terminals, plate and slider knobis 2-7/8"H, 4-3/8"W and 4-1/4"D. Chicago-Jefferson Fuse &Electric Co. Chicago U.S.A.

Jefferson Electric Transformer History (10)

LITTLEJEFF--No. 535-111
50 watts capacity

Jefferson Electric Transformer History (11)Jefferson Electric Transformer History (12)This is asecond version of the Little Jeff for other trains. It has the same wattage butthe voltage is from 5-1/2 to 10-1/2 volts in 1 volt steps. Recommended for allAmerican Flyer, Borgfieldt, and Dorfan "O" gauge outfits. The modelnumber is not marked on the transformer. The 7-position circular slider switchis on the front. The note stamped in the top says "100 to 120V. 50 to 133CY."

The line cord is made of two separate wireswith black cloth on the outside. These are twisted together and exit thetransformer case through a porcelain grommet that says Jefferson 100 1. Theother end has an old style plastic two-prong plug. The transformer case isfastened to a square dish shaped bottom plate at four raised points near thecorners. The transformer case size is 2-1/2"H, 3-1/2"W and3-1/2"D. Size including terminals, plate and slider knob is 2-7/8"H,4-3/8"W and 4-3/8"D. The numbers 5 27 are stamped on the bottomplate. This could be a date of May 1927. Weight is 2.6 lbs.

Jefferson Electric Transformer History (13)

MIDGETToy Transformer
50
watts capacity

Jefferson Electric Transformer History (14)Jefferson Electric Transformer History (15)JeffersonElectric Mfg Co., Chicago, Ill. For use with 110V 60 Cycle. The line cord ismade of two separate wires with black cloth on the outside. These are twistedtogether and exit the transformer case through a porcelain grommet that saysJefferson. The other end has an old style plastic two-prong plug. Thetransformer case is fastened to a square dish shaped bottom plate at fourraised points near the corners. Terminals 1 and 2 are at the left side.Terminals 3 and R are at the right side. The nameplate is black and silver.

The transformer case size is 2-3/4"H,3-1/2"W and 3-1/2"D. Size including terminals, plate and slider knobis 3-1/16"H, 4-1/4"W and 4-1/4"D. Weight is 3.2 lbs.

Switch Voltages
Terminals---Volts in 1-1/2 V steps

Fixed Voltages
Terminals---Volts

3 and R---1-1/2, 3, 4-1/2, 6, 7-1/2, 9 Volts
2 and R---9, 10-1/2, 12, 13-1/2, 15, 16-1/2 Volts
1 and R---16-1/2, 18, 19-1/2, 21, 22-1/2 Volts

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1 and 2---6 Volts
2 and 3---9 Volts
1 and 3---15 Volts

Jefferson Electric Transformer History (16)

MIDGETToy transformer
7
5 watts capacity

Jefferson Electric Transformer History (17)Delivers 18 secondary voltages ranging from 5-1/2 to22-1/2 volts in 1 volt steps, with permanent voltages of 6 and 12 volts. Willoperate Ives trains--all "O" and Nos. 691, 692, 705, 710 and 711standard gauge outfits, American Flyer--all "O" gauge and Nos. 342,347, 350, 351 and 352 standard gauge outfits.

Jefferson Midget Toy Transformer. The 7position linear slide switch is at the top front of the transformer and slidesleft and right. The detented positions are indicated by the gold coloredtriangles. Stamped in the top is a note 25 TO 40 CY. The left hand terminalsare numbered 1 and 2. The right hand terminals are 3 and R. Rating is 75 wattsfor use with alternating current only. Made by Jefferson Electric Company,Chicago.

The line cord is made of two separate wireswith black cloth on the outside. These are twisted together and exit thetransformer case through a porcelain grommet that says Jefferson 100 1. The otherend has an old style plastic two-prong plug. The transformer case is fastenedto a square dish shaped bottom plate at four raised points near the corners.The transformer case size is 3-1/4"H, 4-1/16"W and 4-1/16"D.Size including terminals, plate and slider knob is 3-1/2"H, 4-5/8"Wand 4-1/2"D. Weight is 5 lbs.

Switch Voltages
Terminals---Volts in 1 Volt steps

Fixed Voltages
Terminals---Volts

1 and R---5-1/2 to 10-1/2 Volts
2 and R---11-1/2 to 16-1/2 Volts
3 and R---17-1/2 to 22-1/2 Volts

1 and 2---6 Volts
2 and 3---12 Volts

Jefferson Electric Transformer History (18)

JeffersonTransformer No. 535-171
Midget Toy Transformer (Improved)
75 Watts

Jefferson Electric Transformer History (19)This was called an "improved type" and wasdesigned to be used at the higher line frequencies of 50/133 cycles. This meantthe volume of iron in the core could be decreased for the same performance. Thesize of the box was reduced to 3"H, 3 1/2"W and 4"D. On thelabel it says 100-120 volts 50-133 cycles. On the box it says for standard and"O" gauge American Flyer, Ives "O" gauge and smaller sizedstandard gauge, and Lionel"O" gauge and Nos. 347, 352,353 and 354standard gauge.

The 7 position linear slide switch is at thetop front of the transformer and slides left and right. The detented positionsare indicated by the gold colored triangles. The line cord is made of twoseparate wires with black cloth on the outside. These are twisted together andexit the transformer case through a porcelain grommet that says Jefferson 1001. The other end has an old style plastic two-prong plug. The transformer caseis fastened to a square dish shaped bottom plate at four raised points near thecorners.

Jefferson Electric Transformer History (20)

JeffersonUniversal Transformer No. 535-121
Midget Toy Transformer
75 Watts

For all standard and "O" gaugeAmerican Flyer, Ives "O" gauge and Nos. 691, 692, 701,and 711standard gauge, and Lionel "O" gauge and Nos. 342, 347, 350, 351 and352 standard gauge. Jefferson Electric Mfg. Co. 501-511 S. Green St., Chicago

Jefferson Electric Transformer History (21)Jefferson Electric Transformer History (22)This may be a later version of the Midget Toytransformer. It has the same voltages and wattage. The model number is notmarked on the transformer but is on the box. The 7-position circular slideswitch is on the front instead of the top. The note stamped in the top says"100 to 120V. 50 to 133 CY."

The line cord is made of two separate wireswith black cloth on the outside. These are twisted together and exit thetransformer case through a porcelain grommet that says Jefferson 100 1. Theother end has an old style plastic two-prong plug supplied with a screw baseadapter for a lamp socket. The transformer case is fastened to a square dishshaped bottom plate at four raised points near the corners. The transformercase size is 2-3/4"H, 3-5/8"W and 4-1/16"D. Size including terminals,plate and slider knob is 3"H, 4-1/2"W and 4-3/4"D. Weight is 3.5lbs.

Jefferson Electric Transformer History (23)

TYPENo. 2--No. 535-131
100
watts capacity

Jefferson Electric Transformer History (24)Jefferson Electric Transformer History (25)This modeldelivers 25 secondary voltages from 5-1/2 to 23 volts in 3/4 volt steps.Permanent voltages of 4-1/2, 9, and 13-1/2 volts. Will operate Ives trains--allstandard and "O" gauge outfits, Lionel trains--all standard and"O" gauge outfits, Christmas tree lighting outfits, up to sixteen14-volt lamps.

Jefferson No. 2 Toy Transformer 100 Watts.For 100 to 120V 50 to 133 CY. For Use On Alternating Current Only. The 7position circular slider is mounted on the front of the transformer. The lefthand terminals are numbered 1 and 2. The right hand terminals are 3, 4 and R.Made by Jefferson Electric Mfg. Co. Chicago, Illinois

Switch Voltages
Terminals---Volts in 3/4 Volt steps

Fixed Voltages
Terminals---Volts

1 and R---5-1/2 to 9 Volts
2 and R---10 to 14 Volts
3 and R---14-1/2 to 18 Volts
4 and R---19 to 23 Volts

1 and 2---4-1/2 Volts
1 and 3---9 Volts
1 and 4---13-1/2 Volts

Jefferson Electric Transformer History (26)

TYPENo. 3--No. 535-141
150
watts capacity

Jefferson Electric Transformer History (27)Delivers 25 secondary voltages from 1.2 to 30 volts in1.2-volt steps. Permanent voltages of 6, 12, 18 and 24 volts. Will operate alltypes of electrical trains up to the largest and most expensive, and should berecommended when extra cars and accessories are used with standard outfits.Will also operate Christmas tree outfits up to thirty two 14 volt lamps.

For 100 to 120V 50 to 133 CY. For Use OnAlternating Current Only. The 7 position circular slider switch is mounted onthe front of the transformer. The left hand terminals are numbered 1, 2 and 3.The right hand terminals are 4, 5 and R. Size is 4"H, 5"W and5-1/4"D.

Switch Voltages
Terminals---Volts in 1.2 Volt steps

Fixed Voltages
Terminals---Volts

1 and R---1.2 to 6 Volts
2 and R---7 to 12 Volts
3 and R---13 to 18 Volts
4 and R---19 to 24 Volts
5 and R---25 to 30 Volts

1 and 2---6 Volts
1 and 3---12 Volts
1 and 4---18 Volts
1 and 5---24 Volts

Jefferson Electric Transformer History (28)

JeffersonToy Transformer--No. 535-191
150
watts capacity

Primary 100/120 Volts--50/60 cycles.Secondary voltage has a continuously variable control as well as fixedvoltages. Jefferson Electric Company, Bellwood, Illinois.

Switch Voltages
Terminals---Volts in 1.5 Volt steps

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Fixed Voltages
Terminals---Volts

1 and R---1 to 6 Volts
2 and R---6 to 12 Volts
3 and R---12 to 18 Volts
4 and R---18 to 24 Volts
5 and R---24 to 30 Volts

1 and 2---6 Volts
1 and 3---12 Volts
3 and 5---12 Volts
1 and 4---18 Volts
1 and 5---24 Volts

Jefferson Electric Transformer History (29)

JeffersonStream Liner No. 535-271
75 watts capacity

Jefferson Electric Transformer History (30)

The pointer is mad of formed sheet metal andpainted black. It can be rotated to make contact with multiple voltage taps inthe semicircle for the different speeds. The green lamp lights when thetransformer is plugged in. The red light may indicate that the reset buttonmust be pushed.

Jefferson Electric Transformer History (31)

The lamp cover can be removed to replace the lamps. Writing on the lamp is not perfectly clear. It could be 18 volt or possibly 28 volt. The open circuit voltage at the lamp socket is about 15 volts and the lamp is not that bright when it is on.

The base is threaded and is type E-10.

The colored lamp lenses are plastic

Jefferson Electric Transformer History (32)

The left pair of taps provides a variablevoltage from 8 to 16 volts.
The first and third taps are variable from 16 to 25 volts
The center pair is 9 volts.
The right pair is 9 volts for the whistle.

The transformer is 3-3/4” high, 4-3/4” wiadand 4” deep. Rating ia 115 volts, 50/60 cycle alternating current only.

Jefferson Electric Transformer History (33)

SIGNALINGTRANSFORMER--No. 231-101

Jefferson Electric Transformer History (34)This is undoubtedly a later design and with the newJefferson address. Capacity 50 Volt-Amps, Primary volts 115, cycles 50/60,Maximum current capacity of secondary winding 2 amps. Serial number stamped inthe plate is 218126.

Jefferson Electric Transformer History (35)The top cover can be removed to select the connectionsfor the desired voltages. The two primary connections are in the top section.The four secondary connections are in the bottom section. A 35 ohm 25 wattcontrol is mounted in the top cover (not shown). The control shaft is 2"long and has a screwdriver slot at the end. A 3-prong Amphenol socket ismounted on the right bottom side. I found two rectifier diodes mounted on acircuit board inside plus a 500 mfd 50V-filter capacitor (at the bottom). Thecontrol appears to have been added by someone at a later date. I don't know ifthe rectifiers, capacitor and socket are standard or were also added by someonelater. The diodes and capacitor provide a filtered DC output for the secondarytransformer voltages. The control provides a continuously variable voltage forthe transformer taps selected.

The transformer has brackets at each end atthe bottom. There are holes and slots where it can be permanently mounted to aboard. Height (including brackets) is 3-7/8", width is 4-3/16 and depth is(including brackets) 8-5/8".

Jefferson Electric Transformer History (36)

Jefferson Electric Luminous TubeTransformer

Catalog No. 721-101-100 OutdoorNon-Weatherproof type. Pri. 120V 60HZ. 160VA. Sec. 5000V 30 mA. Sec. StartGrounded. A9001 may indicate a date of manufacture of 1990. MagnaTek JeffersonElectric. The transformer case size is 3-5/8"H, 3-1/8"W and4-5/8"D. Depth including terminals is 7-3/8". Weight is 6.7 lbs.

Jefferson Electric Transformer History (37)

Jefferson Electric Transformer History (38)Catalog No. 721-111 Outdoor Non-Weatherproof type.Pri. 120V 60HZ. 450 VA. Sec. 15,000V 30 mA. Sec. Midpoint Grounded. J7405 mayindicate a date of manufacture of 1974. Jefferson Electric, Division of LittonIndustries, Bellwood, Ill.

Jefferson Electric Transformer History (39)

Jefferson Electric Luminous Tube Transformer

Catalog No. 721-131 Outdoor Non-Weatherprooftype. Pri. 120V 60HZ. 180 VA. Sec. 6000V 30 mA. Sec. Midpoint Grounded. A/Cpower cord has been added. Measures about 8" x 3" x 4". Thistransformer was removed from a neon sign assembly.

Jefferson Electric Transformer History (40)

Jefferson Electric Luminous Tube Transformer

Catalog No. 725-151-700 OutdoorNon-Weatherproof type. Pri. 120V 60 Hz 225 VA. Sec. 7500V 30 mA. Sec. Midpoint Grounded.The A8709 probably indicates a date of manufacture of 1987. Size 3" X3-1/2" X 9". Weight 12 lbs.

Jefferson Electric Transformer History (41)

Magnetek Jefferson Luminous Tube Transformer

Catalog No. 725-141-041 OutdoorNon-Weatherproof type. Pri. 120V 60Hz 270 VA. Sec. 9000V 30 mA Sec. MidpointGrounded. The m 95 05 probably indicates a date of manufacture of 1995.

Jefferson Electric Transformer History (42)

Bell Transformers

Jefferson Electric Transformer History (43)Jefferson Electric Transformer History (44)Thisearly bell-ringing transformer is a single block of white glazed porcelain1/4" thick that's open in the back. The transformer is inside and iscovered with a tar potting material. A metal mounting bracket is attachedthrough holes in the porcelain sides. The words "Pat'd Dec 1, 1925 U.S.A.3-31" are stamped in the bracket. This is probably the date of March 1931.7" insulated primary wires are brought out through two other holes. Twosecondary binding post terminals are at the other end. Cast into the porcelainin raised letters are "Line 110 volts 50/133 cycles" at the primaryend and "Bell 10 volts" at the other end. In the middle is"Jefferson Bell Ringing Transformer, Chicago. Size of the porcelaincontainer is 3-1/8 X 3-1/8" X 1-7/8"

Jefferson Electric Transformer History (45)

Jefferson Electric Transformer History (46)Catalognumber 230-101. Made by Jefferson Electric Company, Bellwood, Illinois. Here isa later bell-ringing transformer. It has two 5-1/2" primary wires on oneside and two secondary screw terminals on the other side.

Size is 2-1/2" high, 2-1/4" wideand 2" deep. Weight is 3/4 lbs. It is painted black. Capacity is 5 watts.It has a UL approval seal.

Jefferson Electric Transformer History (47)

Control Transformers

Jefferson Electric Transformer History (48)Catalog No. 637-271. Made by Jefferson Electric. Thisindustrial control transformer is rated at 50/60 Hz. Primary 120V, Secondary24V at 150 VA (6-1/4 amps). The number on the label is W8205, which may be thedate of May 1982. Case color is blue-gray and the core is black. Primary wiresare 7" long made by Belden. The transformer is UL approved. Size4-1/8"H, 3-1/4"W and 4-3/8"D (including threaded wire exit).Weight is 6 lbs.

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Jefferson Electric Transformer History (49)

Powerformer

Catalog No. 216-1421. Made by Jefferson Electric,Division of Litton Industries, Bellwood, IL. This dry type transformer is in agray steel case. The transformer is potted in a sand/epoxy mixture. It is ratedat 50/60 Hz single phase. High volt is 240/480V and low volt is 24/48V at250kVA (24V at 10.4 amps and 48V at 5.2 amps). (The number on the label isJ8201, which may be the date of January 1982. Size is approximately3-3/4"H, 4"W and 9"D.

Jefferson Electric Transformer History (50)

Jefferson Union Fuses

Jefferson Electric Transformer History (51)Here's abox of five Jefferson Union Fuses 3AG type at 20 amps.
The writing on the back says:

" Fuses are necessary for the protectionof an electrical system, including that of your car. A fuse 'blows' when theelectrical system is overloaded to the point of danger to apparatus and wiring.Union fuses are constructed accurately to burn out at this danger point. When afuse 'blows' and the replacement fuse also burns out immediately, look fortrouble in the electrical system. Do not attempt to use pieces of wire orlarger fuses"

Jefferson Electric Transformer History (52)The box size is 3/8" thick, 1-3/8" wide and1-13/16" long. Weight with the fuses is 0.6 ounces. The address isJefferson Electric Company, Bellwood, ILL.

Inside the box it says:
"Other Jefferson products
TRANSFORMERS:
Radio Replacement
Luminous tube sign
Oil Burner Ignition Control
Door Bell and Signal Toy
Auto and Double Wound
--------------------
Outlet and Switch Boxes
Cut-out Bases and Clips
Metal Clad Mercury Switches"

Manyother Jefferson fuse boxes have been found with several different art layoutsand addresses.

Jefferson Electric Transformer History (53)This box contains five 3AG 3.0 amp fuses. The name onthe box is Chicago-Jefferson Fuse & Transformer Company, Chicago, Ill. Thisis an earlier address than the one above

Jefferson Electric Transformer History (54)

Jefferson Renewal Links

Jefferson Electric Transformer History (55)Catalog number 381-030. Jefferson Union Renewal Links.These fusible links can be used to replace a burned out link in a fuse holder.They come 20 to a box. They are rated at 30 amps and 250 Volts. The box size is1/2" high, 2-5/8" wide and 3/4" deep. The back of the box has anunderwriter's inspection label.

Each link measures 0.011" thick,2-1/4" wide and 1/4" deep. The narrow portion at either end is.048". The center narrow part is 0.10". Imprinted in the metal is"UNION 250 V and 30 is at either end. The tabs must be bent at rightangles about 1/4" from each end to stay in place. Patent dates on acompetitor's link found in the box are 8-15-16 and 2-27-17. This is possibly1916 and 1917.

Jefferson Electric Transformer History (56)

Jefferson Gem Plug Fuses

Jefferson Electric Transformer History (57)Jefferson also made standard home type fuses. This boxcontains five 15 amp fuses. The part number is 388-115. The box is 1-1/4"high, 2-3/4" wide and 1-1/4" deep. Jefferson Electric Company,Bellwood, Illinois. The instructions on the box say:

"BeSure to Use Fuse of the Proper Capacity"

"For home lighting branch circuits useJefferson 6, 10, 12, and 15 ampere fuses, depending upon the total ratings oflamps and appliances on each circuit. Use sizes over 15 amperes for main linecircuits only. All Jefferson plug fuses are listed by and bear UnderwritersLaboratories label for use on 110 to 125 volt circuits."

"Howto Install"

"Open the main switch, go to the fusepanel and reflace all burned out fuses with Jefferson clear window fuses whichpermit you to see at a glance whether or not the fuse element is intact. Thenclose the main switch and the circuit again be in service. If fuses continue toblow, call your electrical dealer or lighting company. . and had the old micawindow."

Jefferson Electric Transformer History (58)Here is a 25 and 30 amp fuse in the same style. Theyhave a clear mica window. The top, threads and base are made of brass. On thetop it say Jefferson Electric and the current rating. The current rating is alsoimprinted on the base. The main body is porcelain. The top is 1-1/8" indiameter and the threads are 1" in diameter. The height is 1-1/8".Weight is 25.5 grams or almost 1 ounce.

Jefferson Electric Transformer History (59)

Industrial Fuses

Jefferson Electric Transformer History (60)

Jefferson also made very large fuses. The topis one is 8-3/4" long and 2-1/16" in diameter. It weighs 927 grams orjust a little over 2 pounds. The exposed knife-blade contacts are 1-5/8" X1-7/8" and 1/4" thick. They are solid copper that is silver-plated.The brass cups at each end are riveted in place. The words 400 A 500 V and J.E. CO are stamped on the side of one of the cups.

Informationon the cardboard box that it came in says:

Stock No P 17-F-17472-4000
Quantity 1 Each Item 5
Fuse Cartridge type C N
400 amp 500 Volt

S.C. Order No. N 151-219S-91311
CP date packed Mar. 1952
Jefferson Electric Company
Bellwood, Illinois

Arc-quenching fuse tubes are used to suppressand/or quench electrical arcing when the fuse material inside blows. Arcing canoccur when fuse link melting is induced by a fault during operation of anelectrical system. To restore normal operation of the system, it is desirableto suppress the arc and clear the fault. Fuse tubes may serve this purpose, andare preferably capable of suppressing and removing arcing conditions. Somefuses have replaceable elements and the tubes must be able to be reused severaltimes.

Fuse tubes, and especially the inner surfaces of fuse tubes, are typicallyformulated from horn fiber, also referred to as bone fiber. Horn fiber is anaturally-occurring substance and is composed largely of keratinous material,which is a tough, fibrous protein. Upon exposure to an electrical arc, hornfiber can decompose, typically by vaporization. This decomposition generallyresults in the rapid generation and evolution of gases which interrupt and quenchthe electrical arc. Horn fiber also possesses desirable mechanical strength andis generally capable of withstanding the

high temperature and pressure conditions that can be created by electricalarcs. The manufacture of horn fiber and products which contain horn fiber, suchas fuse tubes, is difficult and time-consuming. This tends to increase the costof horn fiber and horn fiber products.

The use of horn fiber is mentioned in the 1928 catalog number thirty three ofthe Chicago-Jefferson Fuse & Electric Co. However, horn fiber may beobsolete today being replaced by cheaper and more effective materials.

The lower fuse is for 250 volt 100 ampservice. The blade contacts are solid copper and are not plated..

Jefferson Electric Transformer History (61)

These directions came with a Jefferson ToyTransformer

Directionsfor Operating

JeffersonToy Transformers

WithSpecial Instructions for

TroubleFinding

Caution

Ninety percent of all transformer trouble iscaused by permitting the train to lie across the rails and cause a shortcircuit when it jumps or is knocked off the track.

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Naturally, if there is a short circuit, theload on the transformer is much greater than it is designed to carry and it mayburn out if permitted to remain in that position.

Each transformer has its rated capacity, butwill stand a 25% overload. They should not be expected to take care of aheavier load.

If the transformer is operated on an overloador short-circuit, it will heat up. We recommend placing your hand on thetransformer after 15 or 20 minutes' use. If it becomes very warm, it is anindication of too heavy a load or a short circuit and should be disconnected atonce.

This transformer is intended for intermittentservice and should be used only for short periods at a time. Be sure to turnoff the current when train outfit is not in use.

Remember, burn-outs are only liable fromshort circuits, overloads, and continuous service.

This transformer is purely a toy device andis not designed for continuous or commercial service. It will operate fromalternating current only, of the voltage and frequency specified on thetransformer. If you are not certain of the current, call your electric lightcompany before attaching transformer to the house circuit. This precaution mustbe taken, or you may ruin the transformer.

A 110-volt, 60-cycle transformer will operatesuccessfully on voltages ranging from 100 to 120 volts, and 50 to 133 cycles. A25-cycle transformer will operate on frequencies of from 25 to 40 cycles.

Make all connections from transformer totracks or accessories before attaching to the house circuit, and be sure tohave current shut off when you screw in the plug from the transformer. Two leadwires are furnished with each transformer. Scrape the insulation off the endsof the wires, before attaching to transformer and track.

While Jefferson Transformers will easilystand a 25% overload without harm, we recommend shutting off the currentimmediately when you stop the train, or when the train jumps the track.

Different sizes of trains require differentsecondary voltages. For instance, you have a Midget transformer and desire14-1/2 volts. Connections are made from the track to posts marked R and 2 andadvance the switch lever to the fifth contact. If less voltage is desired moveswitch lever to left; for more power, move to right. If 6 volts are wanted forlighting small lamps, connect one wire, to post No. 1 and the other to No. 2,attaching the other ends to the lamp binding posts.

Other voltages may be obtained by combiningthe various posts. The nameplate on the cover shows how to obtain the variousvoltages. If your train instructions do not specify the voltage to use, attachthe wires to posts R and 1 first. If that does not give enough power to pullthe train, attach the wires to posts R and 2, etc., until the necessary voltageis available. Any of the low voltages may be used singly or simultaneously.Also any number of leads of the same voltage may be used at the same time,provided the section in use is not overloaded.

Toys and other electrical apparatus thatrequire a given battery voltage to operate require 3 to 7 volts higher voltagealternating current to do the same work. For instance, a toy train requiring 8volts direct current will take about 11 volts alternating to do the same work,and it may be run on a trifle higher voltage without any harmful effects.

SpecialInstructions

During past years, transformers have beenreturned which owners claimed are defective. In a large majority of cases wefound, after investigating, that the transformer was all right and that thefault was with some other part of the train system. We give you, therefore, afew hints as to what to look for in case the train does not work whenconnections are made.

Directions for Operating Electric Trains

When the attachment plug of the JeffersonTransformer is connected to the alternating current lighting circuit, the poweris ready. Always start the train with a minimum amount of current and add morevoltage by moving the regulating switch from left to right. Before placinglocomotive on track see that the current is turned off. If the locomotive has areversing controller, see that it is pushed forward or backward as faras possible.

If directions have been carefully followed,the locomotive should start when the power is switched on. Yet it sometimeshappens that the locomotive may have been slightly injured by careless handlingor from rough treatment in shipping. Usually the trouble is so slight that byfollowing our suggestions you will be able to correct it.

ToTest Locomotive

Disconnect the two wires running from thetrack terminals leaving wires attached to Transformer. Turn locomotive upsidedown and hold one wire on motor frame; with the other wire touch shoe, which collectsthe current from the third rail. If locomotive has a reversing controller, besure it is set backward or forward. If locomotive is 0. K., wheels willrevolve. The voltage, which will cause wheels to turn idly, is not sufficientto operate it when on the track, so after you replace locomotive on track, giveit more power than you did while testing it. If it still refuses to move, itmay be that the track is short-circuited or open circuited. Short-circuit meansthat the current of electricity is taking a shorter way back to the Transformerthrough some metallic connection between the middle rail and outside rail orbetween connecting wires. Open circuited means that all sections of the trackare not properly connected.

FindingShort Circuit on Track

Be sure that all sections on track fit snuglytogether and that nothing lies across or stands on the track, not even thelocomotive. Make sure that no metal is in contact with outside and center rail.Then with two wires running from Transformer hold one wire to outside rail andbrush the end of the other wire across the center rail. If the track isperfectly insulated, no sparks will occur when you brush the wire across it;but if it is short-circuited, a spark will occur where the wire touches.

Next locate the short-circuited section.Disconnect one section at a time and apply the wires to the remaining sectionsas above. As soon as the defective section is removed, the sparking will stop.Or disconnect all sections and test each separately. The one that sparks isdefective.

Clean the track with a cloth dampened inkerosene and then wipe perfectly dry. This is important

Howto Get Power from Jefferson Transformers
to Toy Electric Lamp Post, Station and
Semaphores

Always use set voltages only for lighting lampposts, semaphores, etc., running separate wiring for this purpose. Theregulator should be used only for operating the train at various speeds.

When electric railway accessories are to beused, we suggest that you tack the track down on a board or table. This shouldbe a little larger than the track to be used. Fasten down the accessories withsmall screws. When connecting accessories to transformer make sure the lampvoltage corresponds with the voltage being taken from Transformer.

Do not permit the lights to burncontinuously. The transformer is not intended for continuous service.

OperatingChristmas Tree Lights with
Transformers

Christmas tree lights wired in multiple canbe operated through Jefferson Transformers. The principal advantage of multiplewired lights is the fact that should one light burn out the others are notaffected. With the series system one burnt out lamp puts out all the others onthe same circuit, making it difficult to locate the defective one.

The No. 2 Transformer will operate as many assixteen14-volt lamps. Eight of the lights should be connected between bindingposts "1" and "4" and eight between "2" and"R."

The No. 3 type will operate up to thirty-two14-volt lamps by connecting half of the number of lamps between binding posts"1" and "3," and half between "2" and"R."

ExtraWires Enclosed with
Transformers

Two leads of wire are enclosed with eachJefferson transformer to be used in connecting the toys to the binding posts.

OurGuarantee

Jefferson Toy Transformers are guaranteed tobe mechanically perfect when leaving our factory.

Any transformer, which proves defectivethrough poor material or workmanship, will be repaired or replaced free ofcharge.

If the transformer is abused either byoverloading or a short circuit, repairs or replacement will be made at factorycost. Transportation charges must be prepaid on all returns.

Guarantee void if transformer is opened,tampered with or not used according to instructions.

Jefferson Electric Transformer History (62)

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More text and pictures about Jefferson will be added as my research continues. Any comments, corrections, or additions are welcome.

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FAQs

How do you size a transformer for a load? ›

To determine the required transformer VA, multiply the secondary voltage by the required amperes: For example, VA=Volts x Amperes or 28V x 1.2 amperes = 33.6 VA. To determine the maximum transformer current, divide the transformer VA by transformer secondary voltage.

How do you select a transformer on the basis of load calculation? ›

Transformer full load current = kVA / (1.732 x Volt)
  1. Transformer full load current = kVA / (1.732 x Volt)
  2. Transformer full load current = 1000 / (1.73 2× 480) = 1203 Amp.
  3. Short circuit current at TC secondary (Isc) = Transformer full load current / Impedance.
May 12, 2014

What does kVA mean on a transformer? ›

The kVA unit represents kilovolt-amperes, or 1,000 volt-amperes. A transformer with a 1.0 kVA rating is the same as a transformer with a 1,000 VA rating and can handle 100 volts at 10 amps of current.

Can you oversize a transformer? ›

If the load is known or can be predicted, choose a transformer that will be loaded to about 75% of its nameplate rating. Oversizing the unit increases the no-load losses, as well as the purchase price, unnecessarily.

How much load can you put on a transformer? ›

The NEC maximum allowable continuous load on a transformer is 100% of its rating.

How many amps is a 3 kVA transformer good for? ›

Three Phase Transformer
KVA208V240V
AmpsAmps
38.37.2
616.614.4
925.021.7
17 more rows

How many houses can a 100 kVA transformer handle? ›

8 - 500 kVA connects a nominal number of 103 customers, 100 kVA connects 14 customers.

How many amps is a 75 kVA transformer good for? ›

75 KVA is equal to 75,000 VA. (K= 1,000) The full value in VA, 75,000 divided by 1.732 = 43,302, which is then divided by the Voltage 208V = 208.2 Amperes.

How much load can a 100 kVA transformer handle? ›

The 100 kva transformer's secondary voltage estimates the load current at 433 volts, 50 centimeters-per-second (cps). No more than 5% of the whole load current will be increased by a 12.5% increase in voltage of 433 volts.

How many homes can a 25 kVA transformer handle? ›

In a metropolitan area, as many as six or seven homes can be connected to a 25 kVA distribution transformer. For the purpose of this study, all household loads are classified into two categories: controllable and critical [27].

How many amps can a 100 kVA transformer handle? ›

Since transformer are sized based on KVA we need to convert this number to amps in order to know what the transformer is capable of handling. So, for a 100 KVA transformer we will multiply 100 x 1000 and then divide it by 240v. That gives us 416.67 amps.

How many amps can a 50 kVA transformer handle? ›

How many amps can a 50 kVA transformer handle? A 50 kVA transformer can handle around 120.28 amperes at 240 volts 3-phase. First convert 50 kVA to 50,000 VA by multiplying 50 kVA by 1,000. Then divide 50,000 VA by 240 volts to get 208.333 amperes.

How many amps can a 25 kVA transformer handle? ›

Given a 240-Volt single phase transformer rated 25 kVA the maximum Amperage is 25,000/240 = 104 Amperes.

How much amperage can a 60 VA transformer put out? ›

60 Watts / 24 Volts can handle up to 2.5 Amps.

How big is a 150 kVA transformer? ›

Specifications
Height43.75 in (1111.25 mm)
Width32 in (812.80 mm)
Depth27 in (685.80 mm)
Net Weight800.00 lb(US) (362.874 kg)

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