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

Photograph - Black and white of an Electric Supply Co. pillar or switch box, cast iron, with the company on the side and on the base "The British Insulated Wire Co. Ltd Prescot England". This type of item was used to terminate and interconnect feeder cables in both Ballarat and Bendigo.Yields information about the ESCo switch or cable pillars.Black and white photograph on plain paperIn ink on rear "R Green photo" and "See composite caption" which has been crossed out.tramways, tramcars, esco, electrical switching, electrical equipment, british insulated wire company

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

Drawing shows the power supply arrangement to the overhead for the VR St Kilda Brighton tramway, including Elwood depot and substation. Has been marked up for removal of the line south of Elwood Depot to Brighton and Dickens St crossover. Shows the isolating and paralleling switches and their pole numbers. Not known when the original drawing was prepared. The tramway or electric street raikway operated from 1906 to 1959, the section south of Elwood depot closing in two stages during 1956. See reference for history of the line.Yields information about the power supply arrangements for the St Kilda Brighton tramway.Drawing dyeline print and hand coloured with a cloth back sheet with two punch holes on the left hand side to enable filing.Has numerous pencil inscriptions that updated the drawing to c1957 and a "Cancelled" stamp in the bottom right hand corner.tramways, vr, victorian railways, power supply, electrical switching, electrical engineering, st kilda brighton tramway, elwood depot

Instruction book - dark red Rexene covers + 26 pages + 1 sheet which has been added after original publication, sewn with cotton thread into cover which was printed with gold blocking - titled "Electrical Distribution Branch - Instructions and Regulations". Page corners have been rounded. Produced by the MMTB Chief Engineer's Dept, mid 1920's? Provides guidance, rules, instructions for distribution employees in the management of sub-stations, safety. Includes reference to specific employees in the instructions and on the rear page has a single line diagram of Connections for Tramways Board supply from Angliss to Tramways Substation. Angliss was provided with power from, the VR Railways 20000V bus and has specific instructions in the document. Includes reference to Carlton Control. Document issued under the order of T.P. Strickland as Chief Engineer and has been issued to J. F. S. Phiddian - a shift electrician.trams, tramways, electrical engineering, electrical switching, electrical systems, substation, mmtb, instructions, footscray, tower wagon, vr

The photograph shows Ballarat No. 41 northbound at Hospital Corner, Sturt and Drummond Streets, with an ESCo switch or junction box in the foreground. The tram has the destination of Lydiard St North. Photo by Mal Rowe, 22/11/1969.Yields information about the corner of Sturt and Lydiard Sts and an ESCo junction or switch box.Black and white photograph notes on rear.Mal Rowe copyright stamp with number 118,13, and "Corner Drummond St South and Sturt Street"tramcars, tramways, hospital corner, sturt st, drummond st sth, tram 41, electrical equipment, electrical switching

Print of drawing number VB4/7184C "Diagrammatic Arrangement of Feeders and Trolley Wire", marked up in colour showing the various feeder and trolley wire arrangements for the central part of Ballarat and the Gardens line. Shows the detailed switch locations that enable the overhead to be isolated or changed when electrical work was being undertaken on the overhead that required it to be isolated. Shows how the various sections were fed from the power station. Revision C issued 2-9-1958.Yields information about the arrangement of the power supply to the trams from the power station and changes made to the system about 13 years prior to closure. Dyeline print on white paper of Drawing - "Diagrammatic Arrangement of Feeders and Trolley Wire" - VB4/7184Ctramways, ballarat, secv, trolley wire, feeder cables, overhead, power station, electrical engineering, electrical switching

Item used to switch on or off the red tail lights circuit on a tram. Made by the SECV. The board was located next to the 6V battery that was used to power the tram tail lights when the trolley pole was being reversed under a passenger seat.. Demonstrates an item fitted to a tramcar to switch an external lighting circuit.Softwood wood board with a bakelite two pole switch marked "on" and "off" and a Federal 250V 15A rewireable ceramic fuse attached. Has remnants of cloth covered copper wire on the rear. See item 9024 for an associated drawing."12" in blue pencil.fuse, tram 14, tramcars, tramcar maintenance, electrical switching

Item used to switch the power for the red tail lights circuit from the trolley pole to the battery circuit when the trolley pole was being reversed and not able to provide power to the internal and external lights. Made by the SECV. Salvaged from tram 14 during the project to renew the wiring and electrical arrangements of the tram. The box was located adjacent to the driver's windows and would click when the trolley pole was placed back on the overhead.Demonstrates an item fitted to a tramcar to switch an external battery tail lighting circuit.Wooden box made from softwood with bevelled corners, plywood top painted green containing an 8 Ohm "Post Office" type relay (see reference) fitted with two "break" contacts and associated insulated wiring soldered to the relevant contacts. See item 9024 for an associated drawing. Two examples held.fuse, tram 14, tramcars, tramcar maintenance, electrical switching

Yields information about Ballarat Tramways and trams prior to the closure of the tramway system.Set of 10 digital images of Ballarat trams prior to closure, scanned from original slides by Tony Smith, 1971 prior to closure of the system. This set of slides, possibly on the last weekend of Mt Pleasant services - closure took place on 5/9/1971. . .1 - 30 rounding the curve from Lydiard St Nth to Sturt St. Tram has destination of Sebastopol. IN the background is the Commonwealth bank and the SEC cabinet switch isolator on the corner. .2 - 13 and another single trucker at the City terminus, north side with Racey's store and the SEC offices in the background. 13 has a Twin Lakes sign and the destination of Victoria St. .3 - 26 (Mt Pleasant) and 27 at the city terminus, with many passengers. Has the town hall in the background. .4 - 14 turning from Sturt St into Lydiard St (destination does not appear to be Lydiard St nth - City Oval?) with the ANZ bank in the background. A number of passengers waiting at the tram stop. .5 - 14 in Sturt St west near Pleasant St, at City Oval, with the pole being reversed by a "Bounds". Tram has the destination of City Oval. .6 - 13 west bound (showing Mt Pleasant) at Pleasant and Sturt St, with the VicRoads (CRB) offices and St Peters Anglican church in the background. .7 - 13 and 14 in Sturt St west, opposite City Oval (see .5 and .6) - trams reversing. .8 - 13 and 14 at Grenville St, about to cross into Bridge St from Sturt St. .9 - 14 at ditto - both trams for Mt Pleasant. Has the Patersons furniture store in the background. .10 - 30 eastbound in Sturt St, near Armstrong St with the Crockers store in the background. Tram showing "Special"trams, tramways, sturt st, electrical switching, city oval, lydiard st, pleasant st, grenville st, tram 30, tram 13, tram 26, tram 14

Black and white photographs of the Electrical Control room supervisory panel, that was located in Bouverie St and Queensberry St Carlton known as Carlton Control. Photograph most likely taken at the same time as the new panel was implemented - see Reg item 4514 - late 1964. Shows the panel and its set up, maps on the wall and other equipment and a table in front of the operators table or position. The MMTB News - 1721.4 - Vol. 1, No. 4 - 20 pages, November - December 1964, with a colour photo of the new Supervisory control room at Carlton on the front cover. Has articles on; chairman's message, tramway band, Carlton Control - Supervisory Centre, safe electrical working, Christmas celebrations, the old power control centre, a obituary for H. H. Bell, Remembrance day. Printed on gloss white paper.trams, tramways, carlton, substation, electrical equipment, electrical switching, carlton control

Series of five black and white photographs of the Electrical Control room supervisory panel, that was located in Bouverie St and Queensberry St Carlton known as Carlton Control at the time of the implementation late 1964 .1 - General view with the Press standing around. .2 - View of the operators control desk .3 - ditto with the operator at "work" .4 - The room and map without the chair etc. .5 - ditto but a side view. The MMTB News - 1721.4 - Vol. 1, No. 4 - 20 pages, November - December 1964, with a colour photo of the new Supervisory control room at Carlton on the front cover. Has articles on; chairman's message, tramway band, Carlton Control - Supervisory Centre, safe electrical working, Christmas celebrations, the old power control centre, a obituary for H. H. Bell, Remembrance day. Printed on gloss white paper.Items .4 and .5 are stamped on the rear.trams, tramways, carlton, substation, electrical equipment, electrical switching, carlton control

Series of 12 black and white photographs of the construction of a new substation, during 1966 at the corner of Greville St and Punt Road, South Yarra. Shows the vacant block, construction of the foundations, walls and a part of the roof. In the box was a slip of paper marked - "To Architect 6.6.66" See item 7269 for three colour photographs of the completed building.On the rear of some of the photos are dates eg 30/5 on .1 trams, tramways, substation, electrical equipment, electrical switching, buildings

Drawing - titled - "Carlton - Proposed new control room and remodelling of existing control room", coloured with a water colour brush, showing the proposed extensions to the Carlton control room, drawing Number S842, dated 9-5-1961. Shows the ground and first floors, mess room, offices, stairs and control room layout. Has the external elevations and sections.Has some pencil notations front and back re lights and sketch.trams, tramways, carlton, control centre, power supply, electrical engineering, electrical switching

Shows the completed sub-station, built during 1966 at the corner of Greville St and Punt Road South Yarra. See also item 4515 for construction photographs.Shows substation architecture of the 1960sSet of three colour photographs.trams, tramways, substation, electrical equipment, electrical switching, buildings

Type of switch fitted to Melbourne W class trams for switching the line breaker on or off. This switch controls power to the line breaker activated by the tram controller. Had been fitted to the Restaurant tram No. 3 or Cuthberts 939. Was found to be defective - the power was available to the controller even when switched to the OFF position, that is, failed unsafe. Was replaced 4/11/2015 from a spare. Has the name of the manufacturer on the cover. Demonstrates a switch that failed unsafe.Tramcar equipment - line breaker switch - fibre material box and cover containing electrical switch and 10Amp Cartridge fusew class trams, cuthberts 939, switches, line breakers, faulty equipment, safety

A telegraph key or Morse key is a specialised electrical switch used by a trained operator to transmit text messages in Morse code in a telegraphy system. Keys are used in all forms of electrical telegraph systems, including landline (also called wire) telegraphy and radio (also called wireless) telegraphy. An operator uses the telegraph key to send electrical pulses of two different lengths: short pulses, called dots or dits, and longer pulses, called dashes or dahs. These pulses encode the letters and other characters that spell out the message.Metal device with black knob mounted on a wooden base. A plaque with printed text is also attached to the base.Printed: GIVE A SERIES OF DASHES INSTEAD / OF A STEADY EXPOSURE WHEN CALL- / ING FOR LIGHT, OR SHOWING LIGHT. / USE THE PLUG IN No. 1 / SOCKET AS LONG AS THE / LIGHT IS GOOD ENOUGH. / THEN CHANGE TO No. 2 THIS WILL / LENGTHEN THE LIFE OF BOTH BULB / AND BATTERY.morse code, communication, telegraph key, messages, pulses

Agfa plastic mount (blue base, white cover) of a photograph of No. 43 turning from Drummond St South into Sturt St at Hospital corner. Has the shops on the south west corner in the background. Photo taken late 1960's. Tramcar has an SEC roof advertisement. Note the ESCo electrical switch/junction box in the photograph, to the left of the tram. A single truck tram is in the background and the short stubby tram stop pole in Drummond St. South. The slide appears to be a copy slide, given the nature of the colour and the additional number WP415. Photographer could be Bill Pearce (WP). Slide rescanned at 3200 dpi 25-10-2020, jpg replaced, tiff file retained. This file was scanned in 2003 and may show colour changes."BAS 55 in penciltramways, trams, hospital corner, drummond st, sturt st, tram 43

Electrical Switchboard. Three Brass Switches with porcelain bases and two circular screw-top porcelain junction connectors, mounted on a timber board approx. 150mm x 150mm. The porcelain connectors each have 4 holes in the top.electrical, switchboard

Negative No. N380 and black and white print made by a laser printer (stored in folder) of Ballarat No. 25 at the City Terminus, Sturt St, south side. Tram has destination of "Sebastopol" with a Bourne? Liquid Plastic (varnish) ad on the front panel of the tram. Has the Commonwealth bank in the background. Adjacent to a pole is a ESCo / SEC electrical connection / switch box on the left hand side of the tram, which is part of the power supply or distribution system. Date of photo on folder - 5/9/1959. Original negative rescanned 24/5/2020 and image file updated. Paper folder that contained the negative had "NR7A" in red ink, "BA7" in pencil, date stamp of "5 Sep 1959" on front, and on rear date stamps "26 Sep 1962" and "26 Sep 1962".trams, tramways, city terminus, sturt st, commonwealth bank, power supply, tram 25

Instruction - 5 pages - duplicated foolscap sheets - headed "MMTB Engineering Department - Workshops and Running Shed Branch" - titled "Duties of Electrical Mechanics - Runningsheds" Details electrical work to be done on tramcars at the 100 hours service; trolley pole, electrical equipment, controllers, switches, resistance boxes, line breakers, RC units, motors, governor, compressor, lighting, buzzers, door engines, wipers, brake cylinders and general body eg handrails. Dated May 1970.trams, tramways, depot, safety, workshops, electrical equipment, instructions, procedures

In 1832 William McGeoch & Co., Ltd was established, by William McGeoch senior at 113 Argyle St Glasgow as hardware merchants and exporters, and later were manufacturers of lamps and electrical fittings for ship, railway and domestic use. In the 1900s the company had expanded and had offices at 28 West Campbell Street Glasgow with a factory and warehouse located at the Warwick Works, 46 Coventry Rd, Birmingham. In 1922 the company had expanded and were employing 400 to 500 people. William seniors three sons had joined their father in establishing the business around 1888. The business was run by William McGeoch senior with Williams three sons Alexander, William and Andrew also taking an active part in the day to day running of the company. The company had expanded to such a degree that they were now manufacturing a variety of ships' hardware. This included metal cabin furnishings, signal lamps, ships' oil and candle lamps, motor lamps, switches, switchboards, electrical accessories and fittings. In 1982 William McGeoch & Co., Ltd was acquired by Bowthorpe Holdings Ltd.A lamp made by a significant manufacturer of marine equipment that made fittings for many famous ships including the Titanic.Marine oil Lamp with glass panels. Front panel missing. Access through glass panel door at side flat metal back. Metal fuel reservoir and no burner. Metal rounded chimney on top. Embossed McGeogh Maker Glasgowwarrnambool, flagstaff-hill, flagstaff-hill-maritime-museum, maritime-museum, shipwreck-coast, flagstaff-hill-maritime-village, lamp, ships lamp, wm mc geoch ltd, hardware merchants, ships outfitters

Yields information about the equipment offered to Ballarat at the time of the determining what type of signals to put in to improve safety on the system, following the take over by the SEC of the tramways. Gives details about other tramway equipment available on the market place.A set of documents under cover of a Forest City letter dated 29/7/1936 to the General Manager Ballarat, typed in black and red ink. Has a date received stamp of 20 August 1936. Contains the following items. 4911.1 - Letter from "The Forest City Electric Co. Limited" to ESCo re Point controllers, tramway signals and warning signs, dated 29/7/1936 - 2 pages 4911.2 - Collins Patent Automatic Point Turner - sheet 19 - 4 pages - sheet 19, two copies 4911.2a - ditto, sheet 18 QT - four pages 4911.3 - Electrically operated Point switches, overhead frogs and signals for tramcar depots. - four pages 4911.4 - Automatic Tramway Signals - five pages - sheet ATS1 4911.5 - Universal Insulator - Sheet 17 - 2 pages 4911.6 - Porcelain hangers - sheet 15/1 - 2 pages 4911.7 - Porcelain insulators for cap and cone suspensions - page 11, 1 page. 4911.8 - Motor Bus and Tramcar Stage and Fare Signs in Cast Aluminium - sheet MD2 - 1 page 4911.9 - Flashers and Spellers - Sheet F1 - 2 pages 4911.10 - Forest City Relays - 2 pages 4911.11 - Traffic light - 1 page, sheet 2A Note the letter the price of the non car counting signals is 20 pounds, including freight.On letter notes in margins and margin on page 2 against tramway signals, marked in red. On rear of page 2 is a pencil sketch.trams, tramways, signals, overhead, traffic lights, points

Yields information about how the SEC filed pamphlets or information papers about tramway overhead and associated equipment and letters.Green cardboard file folder with metal clip and binder - "The Acorn Individual File - Foolscap size with title blocks containing the following items: 4910 - Tangential Suspension - overhead 4911.1 - Letter from "The Forest City Electric Co. Limited" to ESCo re Point controllers, tramway signals and warning signs, dated 29/7/1936 - 2 pages 4911.2 - Collins Patent Automatic Point Turner - sheet 19 - 4 pages - sheet 19, two copies 4911.2a - ditto, sheet 18 QT - four pages 4911.3 - Electrically operated Point switches, overhead frogs and signals for tramcar depots. - four pages 4911.4 - Automatic Tramway Signals - five pages - sheet ATS1 4911.5 - Universal Insulator - Sheet 17 - 2 pages 4911.6 - Porcelain hangers - sheet 15/1 - 2 pages 4911.7 - Porcelain insulators for cap and cone supension - page 11, 1 page. 4911.8 - Motor Bus and Tramcar Stage and Fare Signs in Cast Aluminium - sheet MD2 - 1 page 4911.9 - Flashers and Spellers - Sheet F1 - 2 pages 4911.10 - Forest City Relays - 2 pages 4911.11 - Traffic light - 1 page, sheet 2A 4912 - Memo re Suitability of Mr A. Widdop as a linesman - 18/11/1936 4913.1 - Letter dated 22/6/1937 from Agent General in London to the SEC Melbourne regarding shipment of the Non-Car Counting Signals. 4913.2 - Letter from the Forest City Electric Co 18/6/1937, regarding forwarding a blue print for the signals. 4914 - Letter from the Forest City Electric Co 23/6/1937, regarding forwarding sample insulators and booklet 15.2 4915 - Letter from Sands Hill Manufacturing Co to ESCo re regarding overhead crossings - dated 13/4/1928. 4916 - Memo dated 14/3/1934 to Mr Pringle, regarding tension in trolley wire. 4917 - Letter from T. Strickland MMTB to Bendigo re standard height for ears above rail level - 16/3/1934. Some of these document Scanned in pdf form to COTMA Library 1/2011 On rear of file: Top of file - "Tramways", in title block "Tramway Overhead & Signals" and in bottom right hand corner - "230". On spine - in pencil - "Overhead Parts and Proceedings"trams, tramways, signals, overhead, pamphlets, manual

Information from Norman F. Dalton: Ballarat had a reticulated DC supply in the early part of last century and in 1905 had sufficient generating capacity to enable the trams to be changed from horse drawn to DC electricity. The use of electricity increased with the main power station located on Wendouree Parade, near Webster Street, under the ownership of The Electric Supply Company of Victoria. AC generating plant was installed in 1925 and conversion to AC proceeded. In 1934 the company was taken over by the State Electricity Commission Victoria (SECV) and more AC generation was installed and the changeover of customers was accelerated. This is around the time that the Synchronome Frequency Checking Mast Clock was installed at the Wendouree Parade Power Station. The SECV Annual Report of 1921 states: ::Section 11 of the act directed the COmmission to enquire into the question of securing the adoption of such standards of plant and equipment of a system, frequency and pressure for the generation and distribution of electricity as will admit of the efficient interconnection of undertakings throughout the State. In 1934 when the SECV took over the Ballarat operations the question of linking with the State grid had been a planned operation for some years but due to financial considerations had hindered it and in fact would continue to do so for a further 10 years. So while the need for close frequency control for interconnection was hardly an issue, the need to keep electric clocks correct was important, particularly as this item was a frequent sales point to cover the inconvenience and sometimes expense of converting from DC to AC. The clock is a very accurate pendulum clock with provision for varying effective length during operation for precise time regulation. There are two normal time dials and one is controlled by the pendulum and the other is operated by the system frequency. When the clock was in use it was installed by the MEter and Tests Laboratory and the time was checked daily by radio time signals. The two dials were repeated in the operators control panel in the Power Station. A maximum deviation between the two dials was set in the operating instructions (eg 5 seconds) and the operator would correct this when necessary by remote manual alteration of the turbine governor set point. The clock was used to drive and regulate a system of "slave" clocks which were used to display the time in various locations around the power station. A slave clock is a simple clock which is driven by a small electric motor, its accuracy is regulated by the master clock every 30 seconds to ensure that it and all the other slave clocks in the station are on exactly the right time; slave clocks were placed in various locations, from common rooms to workshops. A master clock could potentially run thousands of slave clocks at one plant. The clock also contains a rectifier. A rectifier is a device that is used to convert AC power to more stable DC current.Two clocks in a timber case. Both are electric, one is powered by the main pendulum mechanism, the other is a self contained electric clock. The main mechanism is of the gravity arm and roller type, which sends an impulse to the slave clocks every 30 seconds. The This Synchronome Frequency Checking Master Clock was used at the Ballarat Power Station. Below the main section of the case is a smaller cabinet containing a rectifier to provide consistent DC power for the clock. The rectifier was made by the Victorian company Hilco, which was located in Burwood. There is a high chance this is not the original rectifier from this clock as there appears to be brackets to hold a larger device in the space the rectifier occupies.Front below main clock face on front of case: "Patented Sychronome Brisbane" Lower left-hand clock face: "Frequency time" Lower right-hand clock face: "Standard Seconds" Synchronous electric clock mechanism on door (Frequency time clock): >200/250 V. 50~ >"Synchronomains" Made in England >Direction indicator for clock starting switch >"To start move lever in direction of arrow and release" >"Patent applied for" Mechanism for "standard seconds" clock: >"English Made" >"Patented" >Serial number "321" >0 above right-hand pillar on front-plate Mechanism for "standard seconds" clock: >"English Made" >"Patented" >Serial number "321" >0 above right-hand pillar on front-plate Mechanism for main clock face: >"English Made" >"Patented" >Serial number "8751" >0 above right-hand pillar on front-plate Inside case, back panel, top enamel plate: >Seconds Battery + Pos. > Battery Common or - Neg. >1/2 min dials Inside case, back panel, bottom enamel plate: external seconds dial Inside case, right hand side, electrical knobs: two switches, both "A.C. mains" Pendulum rod, below suspension spring: Serial number (?) 0000005 Rectifier in bottom cabinet: >"Hilco Rectifier" >"A.C. Volts 230/240" >"Model 1060/S" >"A.C. Amperes" >"Serial No. 1060/S >"Phases 1" >"D.C. Volts 6" >"C.P.S. 50" >"D.C. Amperes 1" >"Made in Australia by Hilco Transformers McIntyre St., Burwood, Victoria." Bakelite electrical plug: makers mark Lower cabinet, RH side panel, pressed tin plate: "AC" (upside down) Brass speed adjustment, outer right RH side: "S" and "F" Ivory and wood pendulum beat ruler: >Ruler, with 0 in centre and numbers 1-5 in ascending order from centre on left and right. > "Synchronome Patent." Steel plate, back panel, inside case, right hand side: >N R A" (descending) >"2191" serial number/part number Face of main clock: "Synchronome Electric" synchronome frequency checking master clock, electricity, state electricity commission, wendouree parade power station, secv, clock, time, pendulum, electric supply company of victoria, norman f. dalton, ballarat power station, rectifier, slave clock

Typed letter on Mount Morgan Gold-mining Company, Limited Letterhead relating to staffmember W. Gildard who worked in the Electrical Department at Mount Morgan. The letter is signed by Norman F. White..1) I hereby certify the Bearer Mr W. Gildard has been under my supervision this last two years and six months in Electric Light Dept Mount Morgan G.M.Co. Ltd While under me he was quick steady and industrious also possessed good mechanical ideas. He has been switch board and Dynamo attendant worked on outside circuits series are Lighting Mine Lighting under Ground Electric Bells and Telephone work. He has had experience also on our new plant turbo generators Stationary Motors and Electric Locomotives Electric Tramway Work over head wiring and ground return you will also find him most obliging and willing. Leaving of his own accord. Frank McFarlane A.G.E.E. Electric Foreman Mount Morgan G.M. Co. Ltd march 21st 1907ballarat school of mines, mount morgan gold-mining company, mount morgan, norman f. white, electricity, w. gildard, letterhead

What device converts AC to DC? rectifier A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction. The process is known as rectification, since it "straightens" the direction of current. The unit was used at Ballarat School of Mines in the Maths, Science and Physics Departments.Grey metal unit with Dials on the front and vents at the back. Handle for carrying. Two switches for turning on and off. Yellow sticker - SMB - with number 116071. Engraved on back - S.M.B.. Maths / Science / Physics Sticker on cord indicating inspection of unit - 13/04/2005. Tag Number - 032735alternating current, direct current, ac, dc, rectifier, electrical, ballarat school of mines, science, maths, physics

Students potentiometer type D-73-A. Black top panel with terminal posts, elector knobs and switches. In a polished wood box wit lift-off lid. Circuit diagram inside lid. Serial Number 3008scientific instrument, potentiometer, physics, electrical engineering, laboratory

Used in Physics and Electrical Engineering laboratory experimentsPotentiometer, Type D-73-E in polished wood box with lift out circuit diagram inside the lid. Black top panel with terminal posts, switches and selector knobs.Black Dymon tape on lid "Ass.No. 50"scientific instrument, potentiometer, physics, electrical engineering, laboratory