Showing 303 items
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Ballarat Tramway Museum
Document - Report, B. Prentice, "Resistances - WH225, GE 201 motors, T1F, K36JR and B23D controllers", 10/05/1973 12:00:00 AM
... Electrical Equipment... Electrical Equipment Electrical Systems Tramcars Motors Controllers ...Yields information about the specifications of various combinations of controllers and motors.Report - set of three quarto sheets - drafts and completed documents, titled "Resistances - WH225, GE 201 motors, T1F, K36JR and B23D controllers", detailing the resistance steps, grid types and resistance. Compiled by Bob Prentice , dated 10/5/1973.trams, tramways, resistance grids, electrical equipment, electrical systems, tramcars, motors, controllers -
Melbourne Tram Museum
Drawing, The Met, Electrical drawings for Z1 and Z2 tramcars, c1995
... Electrical Equipment... Engineering Electrical Equipment Electrical Systems Z3 class Black ...Black plastic folder with black plastic comb binder containing plasticized drawings for the Z1 and Z2 class tram circuits (45 pages), Z3 tramcars (47 sheets), notes on the CCU Test cards and performance and a list of controller wiring diagrams, for all tramcars and some of the associated drawings. Prepared by the Met Tram Servicing branch. Not dated.trams, tramways, z class, instructions, controllers, electrical engineering, electrical equipment, electrical systems, z3 class -
Melbourne Tram Museum
Letter, Australian General Electric, "Footscray Tramway Substation", early 1920's
... Electrical Equipment... Trams tramways Footscray Substation FTT Electrical Equipment ...Set of letters, delivery documents, lists of equipment and cost estimate sheets for the provision of sub-station and rotary converted equipment by Australian General Electric Company to the MMTB for use at the Footscray Tramway Substation, covering the period of late 1920 to mid 1922. Details typed lists and letters, carbon copies and handwritten estimates. Prepared by quarto and ruled foolscap paper, some secured by paper clips.trams, tramways, footscray, substation, ftt, electrical equipment, electrical engineering, contracts, general electric, mmtb, rotary converters, tramway construction -
Melbourne Tram Museum
Photograph - Colour Photograph/s, 1993
... Electrical Equipment... Trams tramways Substation Electrical Equipment Electrical ...Set of four Polaroid prints of a Mercury Arc rectified bulb. One photo has written on rear "Hewittic Rectifiers type 500/6". Image i4 has a person standing alongside. See Inscriptions. Craig Tooke, formally of Yarra Trams substations advised 12/8/2020 by email to Warren Doubleday. "An interesting photo. I don’t know who the person in the photo is. More than likely the bulb in from an industrial installation such as mine etc. and not tram or train. The reason is that only Melbourne trams has Hackbridge Hewittic rectifiers that were used for traction. There was three sets of bulbs installed at West Brunswick, Deepdene and Preston. West Brunswick is definitely still in existence and probably Deepdene is still in existence as the old substation was abandoned intact and just left intact. Preston of course has gone and was removed as part of the work done at PWS. Another clue is the number 500/6 which means it was from a 500 kW – 6 bulb unit. The traction units were all in multiples of 150 kW per bulb i.e. the tramway ones were 600 kW rated. The number "40246" is the bulb serial number. Each bulb manufactured had an individual serial number. Interesting the bulbs at Brisbane Tram Museum have the following serial numbers to the ones that were at Essendon tram sub. The bulbs at Essendon of course are now up at Brisbane as spares."On the envelop with the photographs is "Keith Wilkinson Ph Orbost 051 510050" and "For Bill Kingsley 4/10/93".trams, tramways, substation, electrical equipment, electrical engineering, mercury arc -
Melbourne Tram Museum
Document - Report, "W class Tram Modernisation", 25/10/2013 12:00:00 AM
... Electrical Equipment... Trams tramways TTM Rail Braking Electrical Equipment Electrical ...Report - "W class Tram Modernisation" from the ttmrail webpage, 2 A4 sheets stapled in top left hand corner, details the changes - DC Traction chopper system, controllers, inverters, controls, drivers cabins, lighting and drivers and saloon heating systems.trams, tramways, ttm rail, braking, electrical equipment, electrical systems, electrical engineering, controllers, w class -
Melbourne Tram Museum
Photograph - Set of 2 colour prints, Robert Green, PMTT Cable pillar box, 3/1990
... electrical equipment... engineering electrical equipment electrical switching switch box Set ...The colour prints show a Prahran and Malvern Tramways Trust - PMTT electrical switching or cable pillar box in City Road, near Queensbridge St, South Melbourne.Yields information about a former PMTT Electrical switch boxSet of 2 colour prints on Crystal Archive paper and 35mm negatives.tramways, pmtt, electrical engineering, electrical equipment, electrical switching, switch box -
Ambulance Victoria Museum
Monitor defibrillator, Lifepak 10, Physio-Control Corporation, Circa 1982
... Cream coloured electrical equipment with carry handle... electrical equipment with carry handle. Green monitor screen ...Entered service in around 1982. Remained in service for around 4 years and mainly used in ural areas.Cream coloured electrical equipment with carry handle. Green monitor screen and paper chart printer built in. Red fabric carry case on item.PHYSIO-CONTROLdefibrillator, resuscitation -
Kiewa Valley Historical Society
Electric Megger (Insulation Tester) and its case
... electrical meters, electrical equipment, fuses, safety... to the advancement of technology. electrical meters, electrical equipment ...Megger as the device was called, is in fact its brand name. It is a device that supplies a DC (direct current as per car batteries) voltage to enable testing of electrical apparatus. This particular device produces 250volts DC when the handle is turned vigorously. If an electrical device, such as a kettle or toaster, blew a fuse or tripped a circuit breaker, when switched on, then it must be checked electrically before any more use. Following the repair of the faulty item a megger would be used to check if either of the AC 240volt plugs leads were touching the metal case (earth). The output leads of the megger would be connected with one to the earth (metal case) and the other to each of the power connections in turn. A good megger reading of 50,000 ohms (resistance) would enable the device to be returned to service. A reading of zero ohms resistance would mean that it would again blow a fuse, and was therefore unsafe to use. In the electrical industry e.g. the former State Electricity Commission, a megger would be used to test lots of similar item in sequence. Because of the vigorous job of winding the handle, two persons were often used to save time. One would crank madly whilst the other shifted the leads. This particular megger is of a small voltage, but other meggers are bigger and have a few ranges of DC voltages able to be selected. The optimal megger for large Generating machines was motor driven megger. This was applied to the device being tested for a duration of approximately 30 minutes with reading of the resistance taken at regular intervals.All equipment belonging to the State Electricity Commission of Victoria was labelled with a metal plaque attached to it. The SECV constructed the Kiewa Hydro Electric Scheme in the Upper Kiewa Valley and on the Bogong High Plains. The scheme began in 1938 and finished in 1961 when this megger was used and also possibly later as the SECV remained to maintain and operate the Scheme. This megger is of significance in relation to the advancement of technology.A rectangular box in dark brown bakerlite casing. It has an agent's plaque fixed to the left of the face and on the right is the marker's recessed stamp. In the middle in a transparent window so the level of ohms can be read. The front also has two recessed fixing knobs in black. On one side is a crank handle with a knob that lifts up and is turned vigorously to create the voltage. The back has four recessed screws and four small leather pads. There is a hole on each side to insert wires. There are two copper insulated wires. The SECV Plaque states: State/Electricity Commission/of/Victoria/ Electrical Engineer's Section/ No.1747 The Agent's Plaque states: H. Rowe & Co. Pty Ltd/Melbourne & Sydney/Sole Agents/in Australia for/Evershed & Vignoles Ltd Maker's states: 500 volts/Megger/Regd Trade Mark/Made in England/Patent No/400728electrical meters, electrical equipment, fuses, safety, state electricity commission of victoria, mt beauty, bogong village -
The Ed Muirhead Physics Museum
Resistance Decade Box, mid-20th Century
... electrical equipment... and 452 j. l. william decade box electrical equipment resistance ...This object is believed to be associated with training at the Parkville Secondary Teaching College during the 20th Century.Related to objects 450 and 452This rectangular wooden resistance decade box features four large dials for controlling resistances. The dials are mounted atop a black plastic panel, each with a square base. Three smaller dials are mounted to the right of the large dials.Embossed plaque at front: 'J. L. WILLIAM / SCIENTIFIC INSTRUMENTS / SERIAL No 3960 / TYPE RB4DS / MELBOURNE / AUSTRALIA' Engraved and filled white on top plate from left to right: 'ABSOLUTE OHMS AT 20 C / MANGANIN' Logo reading: 'J. L. WILLIAM / SCIENTIFIC / INSTRUMENTS / MELBOURNE / SERIAL No 3960' 'ZERO RESISTANCE / 0.004 OHM' Engraved on back edge of top panel: 'SECONDARY TEACHER COLLEGE PARKVILLE' Dials are labelled underneath with unit measurements for resistance settings, engraved and in-filled white.j. l. william, decade box, electrical equipment, resistance decade box, scientific instruments -
The Ed Muirhead Physics Museum
Resistance Decade Box, mid-20th Century
... electrical equipment.... william electrical equipment scientific instruments ...Related to objects 450 and 451.Resistance decade box constructed from rectangular base of ferrous metal with black plastic top. Top displays five circular dials with three smaller circular dials on the right. Embossed plaque at front: 'J. L. WILLIAM / SCIENTIFIC INSTRUMENTS / SERIAL No 3012 / TYPE RR5S / MELBOURNE / AUSTRALIA' Engraved and filled white on top plate from left to right: 'ABSOLUTE OHMS AT 20 C / MANGANIN' Label reading 'PHYSICS PT 2 222 A4' Logo reading: 'J. L. WILLIAM / SCIENTIFIC / INSTRUMENTS / MELBOURNE / SERIAL No 3012' 'ZERO RESISTANCE / 0.006 OHM' Dials labelled underneath with unit measurements engraved and filled white.decade box, resistance decade box, j. l. william, electrical equipment, scientific instruments -
Ballarat Tramway Museum
Functional Object - Electrical Meter, 24/01/2011 12:00:00 AM
... Electrical Equipment... there. Trams tramways Depot Meters Electrical Equipment ...Possibly has a strong association with the Ballarat depot and the equipment used there.Electrical Current or Amp Meter mounted onto a piece of timber. Meter has the current marked in Amps from 0 to 15. No manufacturer or use details known, would have been collected from the depot. Could have been used for the grinder or wheel lathe. Wood block has four mounting holes, bevelled edges and opening for cables on the lower edge. White meter face, has a marked reading of 6Amps. Rest of the meter is generally painted black except for the bottom and rear of the timber which is unpainted. trams, tramways, depot, meters, electrical equipment -
Ballarat Tramway Museum
Functional Object - Electrical conduit, 21/01/2018 12:00:00 AM
... Electrical Equipment... the 1920's. Trams tramways ESCo Electrical Equipment House ...Yields information about the materials and the methods of installing electrical domestic cables in Ballarat houses during the 1920's.Section of timber or wooden electrical conduit used in houses c1920, to contain wires for electrical lamps and fittings. Consists of a timber base (very light softwood - ??) with two slots that was nailed to a wall and after the cable installed a cover strip applied. Has one end mitred or cut at 45 degrees. See Early Electrical wiring systems in American buildings - L. D. Mitchelltrams, tramways, esco, electrical equipment, house extensions, houses, electricity -
Ballarat Tramway Museum
Photograph - Digital image Set of 2, Chris Phillips, c1970
... Electrical Equipment... Electrical Switching Electrical Equipment ESCo tram 27 tram 12 tram ...Yields information about the City terminus on the south side of Sturt St and the passenger traffic prior to closure of the system. Shows many people boarding the tram.Set of two digital images of trams at the City terminus on the south side of Sturt St, c1970. and corner with Lydiard St. .1 - No. 27 and another single trucker loading large crowds of passengers at the tram stop. No. 27 has the destination of City Oval. In the background is the Commonwealth Bank building. The tram has a Twin Lakes sign. .2 - Four trams at the same stop, from rear - 12, 43, 26 and ?. No. 12 has the destination of Sebastopol and has a Twin Lakes sign. Has the Town Hall in the background and the ESCo pillar cabinet on the corner.trams, tramways, sturt st, city oval, city, lydiard st, electrical switching, electrical equipment, esco, tram 27, tram 12, tram 43, tram 26 -
Ballarat Tramway Museum
Negative - Set of 10, Campbell Duncan, 10/08/1971 12:00:00 AM
... Electrical Equipment... Drummond St Sturt St Electrical Equipment tram 35 tram 39 tram 31 ...Yields information about tram operations and the street views at Hospital Corner.Set of 10 photographs taken on 10/8/1971 by Campbell Duncan of trams at Hospital Corner. .1 - No. 35 turning from Sturt into Drummond St South heading for Sebastopol. .2 - No. 31 inbound to Mt Pleasant with Hospital in background. Tram has two Johnny Walker whiskey roof adverts. .3 - No. 27 turning from Sturt St into Drummond St North, to the Gardens. Has the Mobil Service station and other buildings in the background and the ESCo street pillar. .4 - No. 43 turning from Drummond St South into Sturt St with the Southern Cross Hotel etc in the background. .5 - ditto - side on view. .6 - No. 39 and a single trucker on the north side of Sturt St - No. 39 has arrived from the depot via Sturt St west and about to turn to run to Grey St. .7 - ditto .8 - ditto .9 - ditto .10 - No. 39 crossing Sturt St in Drummond St.trams, tramways, hospital corner, drummond st, sturt st, electrical equipment, tram 35 tram 39 tram 31 tram 27 tram 43 -
Ballarat Tramway Museum
Functional Object - Tramcar component, Cartridge fuse
... Electrical Equipment... Engineering Electrical Equipment ...Cartridge fuse - Tramcar Component - black Bakelite? with brass ends, possibly containing a powder given the weight and a fuse wire. Has remnants of a paper label around the centre. No details of the of the manufacturer or date. Type used for a compressor fuse. At one end has a diamond with a vertical bar through the centre and 10 stamped into the brass end - possibly a 10Amp fuse and possibly the manufacturer's symbol.fuse, tramcars, electrical engineering, electrical equipment -
Ballarat Tramway Museum
Functional Object - Electric Lamp or light bulb, Edison Company, 25/08/2021 12:00:00 AM
... Electrical Equipment.... Trams tramways Tramcars Scrubber Tram Electrical Equipment ...Demonstrates the type and style of lamp used in tramways or street cars, made by a company who specialised in the manufacture of electrical products.Electric Lamp or light bulb - stored in a cardboard box with shredded paper. Lamp manufactured by the Edison Company of the USA, for "Street Railway" use. Consists of a glass bulb with a wire vertical filament with a screwed base. Marks on top of the lamp have faded. Filament appears to be working order. Information on the top of the lamp and the box provided by the donor. Made in the USA - possibly New Jersey See https://en.wikipedia.org/wiki/Edison_light_bulb - accessed 25-08-2021 for a short history of the lamp.trams, tramways, tramcars, scrubber tram, electrical equipment, lights -
Ballarat Tramway Museum
Book, Australian Commonwealth Engineering Standards Association, "Parallel sided carbon brushes for DC Commutator Machines", 1927
... Electrical Equipment...". Trams tramways Tramways Electrical Equipment Motors Australian ...Book - 16 pages + grey covers, side stapled, issued by the Australian Commonwealth Engineering Standards Association, Tentative Australian Standard C.43-1927, "Parallel sided carbon brushes for DC Commutator Machines". Dated Dec. 1927. Provides an index and information about carbon brushes including drawings.On top right hand corner has stamp of the "The Electric Supply Co. of Victoria Ltd Ballarat" and date "19 May 1928".trams, tramways, tramways, electrical equipment, motors -
Ballarat Tramway Museum
Book, British Engineering Standards Association, "Radio-Interference Suppression for Trolley Buses and Tramways", 1939
... Electrical Equipment... Electrical Equipment British Engineering Standards Association ...Book - 36 pages + light grey covers, pushed by the British Standards Institution, British Standard No. 827 - 1939, titled "Radio-Interference Suppression for Trolley Buses and Tramways". Provides an index page and many drawings.On top right hand corner has stamp the SEC stamp, Ballarat Branch and a received dated of 6 Oct. 1939. Has "Mr Morrison" in pencil on the cover.trams, tramways, tramways, electrical equipment -
Ballarat Tramway Museum
Book, British Engineering Standards Association, "Cast Steel Wheel Centres for Electric Tramcars", "Wrought Iron Wheel Centres for Electric Tramcars", 1922
... Electrical Equipment... "14 September 1923". Trams tramways Tramways Electrical ....1 - Book - 20 pages + light grey cover, issued by the British Engineering Standards Association, British Standard Specification for "Cast Steel Wheel Centres for Electric Tramcars". Dated April 1922. Has standard Number 150-1922. Provides materials specification, testing and an index. .2 - Book - 16 pages + light grey cover, issued by the British Engineering Standards Association, British Standard Specification for "Wrought Iron Wheel Centres for Electric Tramcars". Dated April 1922. Has standard Number 149-1922. Provides materials specification, testing and an index. Both copies has the stamp of the "Tait Book Co. 90 William St. Melbourne" on the lower edge and in the top right corner, the ESCo Ballarat company stamp and the date "14 September 1923". trams, tramways, tramways, electrical equipment, wheels -
Ballarat Tramway Museum
Book, Australian Commonwealth Engineering Standards Association, "Electrical Performance of Traction Motors - Direct Current Series Wound", 1925
... Electrical Equipment...". Trams tramways Tramways Electrical Equipment Motors Australian ...Book - 24 pages + grey covers, side stapled, issued by the Australian Commonwealth Engineering Standards Association, Tentative Australian Standard C.2 - 1925, "Electrical Performance of Traction Motors - Direct Current Series Wound". Dated Dec. 1925. Provides an index and information about enclosures, ratings, testing and information to be supplied.On top right hand corner has stamp of the "The Electric Supply Co. of Victoria Ltd Ballarat" and date "17 April 1934".trams, tramways, tramways, electrical equipment, motors -
Ballarat Tramway Museum
Functional Object - Insulator for tramway overhead - made in Japan, c1950
... Electrical Equipment... Electrical Equipment ...Its manufacture demonstrates from an industrial aspect a period of history following the occupation of Japan by the USA after the second world war and has a strong association with this event.Insulator - known as an egg type - ceramic - fired clay (porcelain) finished with a brown colour with two holes for span wire with the holes offset to each other. Marked in a very light almost clear finish on one side "Made in Occupied Japan" See item 8534 for another example - a larger size. https://www.gotheborg.com/glossary/occupiedjapan.shtml - accessed 15/4/20201 gives some background: "For the period from the end of World War II in 1945 through April 28, 1952, the United States and its Allies occupied Japan. The Occupation involved approximately 130,000 Americans (both military and civilian) and about 35,000 British Troops based in Japan. SCAP (Supreme Commander for the Allied Powers), led by General MacArthur, wrote a new constitution for Japan. As Japan needed to rebuild their economy after the war, part of the agreement to allow them to export goods out of their country was that they had to mark 50% of all items with "Occupied Japan" or "Made in Occupied Japan." This could be done with a paper label, cloth label (as on scarves, doilies, clothing), engraved, handwritten or stamped. Thus, you may come across things, such as a salt and pepper set, where only one of the pair is marked OJ and the other will just have "Japan" on it. The tags, labels, marks were placed on the items in Japan, before they were exported to other countries. "trams, tramways, overhead, trolley wire, insulation, electrical equipment -
Ballarat Tramway Museum
Drawing, British Thomson Houston, "BTH XD13398, Dimensions of MR4EE Circuit Breaker", 1912
... Electrical Equipment... British Thomson Houston Circuit Breakers Electrical Equipment ...Drawing - Quarto blue print, British Thomson Houston Pty Ltd, Drawing No. XD13398, Dimensions of MR4EE Circuit Breaker, Cat No. C5708 - dated 24 May 1912. Similar to the type used on Ballarat single truck trams.drawings, british thomson houston, circuit breakers, electrical equipment -
Melbourne Tram Museum
Photograph - Black & White Photograph/s, Melbourne & Metropolitan Tramways Board (MMTB), c1950
... Electrical Equipment... Electrical Equipment Black and White Photograph of a transformer face ...Black and White Photograph of a transformer face plate for a British General Electric transformer for use in Mercury Arc Rectifier Equipment, made 1950. Provides details of the transformer capacity, ratings and wiring diagram. Made at the EPM Works, Waterloo NSW.trams, tramways, transformer, mercury arc, substation, electrical equipment -
Melbourne Tram Museum
Document - Instruction, Melbourne & Metropolitan Tramways Board (MMTB), "K35JJ, K35 AA2, RC1, RC2, EECK1 (Clyde) controller maintenance - Tradesman's assistant procedures", May. 1970
... Electrical Equipment...Trams tramways Depot Safety Workshops Electrical Equipment ...Instruction - 1 pages - duplicated foolscap sheets - headed "MMTB Engineering Department - Workshops and Running Shed Branch" - titled "K35JJ, K35 AA2, RC1, RC2, EECK1 (Clyde) controller maintenance - Tradesman's assistant procedures" Details electrical work to be done on the rostered day in for the work to be carried out assisting the Electrical Mechanic on his work, including lubrication. Dated May 1970.trams, tramways, depot, safety, workshops, electrical equipment, instructions, procedures, controllers -
Melbourne Tram Museum
Document - Instruction, Melbourne & Metropolitan Tramways Board (MMTB), "EECK1 (Clyde) Controller Maintenance - Electrical Mechanics Procedure", May. 1970
... Electrical Equipment...Trams tramways Depot Safety Workshops Electrical Equipment ...Instruction - 4 pages - duplicated foolscap sheets - headed "MMTB Engineering Department - Workshops and Running Shed Branch" - titled "EECK1 (Clyde) Controller Maintenance - Electrical Mechanics Procedure" Details electrical work to be done on the rostered day in for EECK1 (Clyde) controllers, safety, checking, when to replaced and additional work to be done on the 4th and 12th rostered day-in service. Dated May 1970.trams, tramways, depot, safety, workshops, electrical equipment, instructions, procedures, controllers -
Melbourne Tram Museum
Document - Instruction, Melbourne & Metropolitan Tramways Board (MMTB), "RC1 and RC2 remote control unit boxes - Electrical Mechanics Procedure", May. 1970
... Electrical Equipment...Trams tramways Depot Safety Workshops Electrical Equipment ...Instruction - 3 pages - duplicated foolscap sheets - headed "MMTB Engineering Department - Workshops and Running Shed Branch" - titled "RC1 and RC2 remote control unit boxes - Electrical Mechanics Procedure" Details electrical work to be done on the rostered day in for RC1 and RC2 remote control unit boxes maintenance, checks, adjustments, safety, testing and closing the boxes. Dated May 1970.trams, tramways, depot, safety, workshops, electrical equipment, instructions, procedures, controllers -
Melbourne Tram Museum
Document - Instruction, Melbourne & Metropolitan Tramways Board (MMTB), "Line Breakers GE and EE type - Electrical Mechanics Procedure", May. 1970
... Electrical Equipment...Trams tramways Depot Safety Workshops Electrical Equipment ...Instruction - 2 pages - duplicated foolscap sheets - headed "MMTB Engineering Department - Workshops and Running Shed Branch" - titled "Line Breakers GE and EE type - Electrical Mechanics Procedure" Details electrical work to be done on the rostered day in for GE and EE type line breakers, maintenance, checks, adjustments, safety, testing and closing the boxes. Dated May 1970.trams, tramways, depot, safety, workshops, electrical equipment, instructions, procedures, controllers -
Melbourne Tram Museum
Document - Instruction, Melbourne & Metropolitan Tramways Board (MMTB), "RC1 and RC2 remote control unit boxes - Tradesman's assistant procedures", May. 1970
... Electrical Equipment...Trams tramways Depot Safety Workshops Electrical Equipment ...Instruction - 3 pages - duplicated foolscap sheets - headed "MMTB Engineering Department - Workshops and Running Shed Branch" - titled "RC1 and RC2 remote control unit boxes -Tradesman's assistant procedures" Details electrical work to be done on the rostered day in for RC1 and RC2 remote control unit boxes by the Tradesman's assistant for the Electrical Mechanic. Dated May 1970.trams, tramways, depot, safety, workshops, electrical equipment, instructions, procedures, controllers -
Melbourne Tram Museum
Drawing, Melbourne & Metropolitan Tramways Board (MMTB), "Plan showing types and sizes of overhead troughing in Depots", post 1964
... Electrical Equipment... Electrical Equipment Drawing - original dyeline print - folded ...Drawing - original dyeline print - folded into 16, showing dimensions and layout of the wooden troughing in 16 different sheds at the depot - e.g. old and new Malvern. Prepared July 1934. Drawing Number 06739A Revision A Feb. 1964trams, tramways, depot, overhead, trolley wire, trolley poles, electrical equipment -
Melbourne Tram Museum
Document - Report, Melbourne & Metropolitan Tramways Board (MMTB), "Bridging Transition", early 1960's
... Electrical Equipment... Electrical Equipment Motors Electric Traction Report - single ...Report - single foolscap sheet titled "Bridging Transition" describing the electrical circuit arrangements while passing from series to parallel in DC traction tramway motors.trams, tramways, tramcars, controllers, electrical engineering, electrical equipment, motors, electric traction