A telegraph or Morse key, sends a series of electrical signals down a telegraph line or via radio frequencies; the signals are interpreted as Morse code, a binary form of language constructed of 'dots and dashes', combinations of which correspond to letters of the alphabet. The motion of the key acts to complete an electrical circuit between the sender and receiver, producing a short pulse 'dot' or longer 'dash,' the space between the code indicates a broken current or wave.Device used to transmit telegraphic messages in Morse code through the manipulation of electric signals. The metal 'key' sits in a central bracket on which it moves up and down aided by a spring, controlled by an operator pushing the black Bakelite knob on the protruding end of the device. The motion presses the key onto a circular metal disc, completing the circuit and sending an electrical pulse to the receiver. The apparatus is secured to a wooden base with wires attached to the terminals; a cut out section of the base suggests wires may have entered through this area, attaching to a battery.Printed ink on base: "PMG"telegraph, telegraphist, morse code, mechanisation

Cardio phone 12 lead ECG transmission cardiac rhythm over telephone to cardiology department of receiving hospital, mica units had direct admission rights with receiving hospital, the receiving hospital decoded the rhythm and advised the ambulance crew of action required, these units were battery powered.Grey metal box containing built in electrical/medical equipmentBOTH ELECTRO-CARDIOGRAPH

Prisoner issue Headphones for use in the cells of the HM Prison GeelongPair of Bakelite headphones supported by metal headpiece with electrical cable.geelong, gaol, museum, headphones, bakelite

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

This protection relay apparatus (a large electrical fuse), which permits the easy monitoring and disconnection of faulty electrical apparatus connected to the large SEC Victoria Hydro Scheme's electrical power producing generators. These generators are powered by the hydro force of "stored" water at a higher altitude. The establishment of both the NSW and Victorian Hydro Schemes was achieved from the early 1900's to the 1960's. At this point in time the need for additional power sources to quench both an industrial and domestic demand for electricity was purely an economic and not and environmental (carbon reduction) factor. This hydro scheme was instigated by "the Government of the day" as a bold move and was the major force of the World War II refugee and "technical" workforce inclusion of skilled and unskilled migration into the Australian environment. Although this mass "invasion" of workers with families was thought of in some circles as intrusive, the expansion of population post war years and its integration into the Australian rural sector, produced the multi- lingual multi-cultural diversity of later years.This protection relay is very significant to the Kiewa Valley as its use was introduced during the Kiewa Hydro Scheme. Although only a small apparatus it was part of the explosion of human resources into the valley. This influx of population transformed the region from that of a basically quiet rural region to one which evolved into both an industrial and a larger residential community. This evolution in the valley created a change, not only in the "physical" landscape but also the socio-economic expansion which permitted other "tourist" based industries into the valley.This protection relay unit has a black painted metal shell with four copper enclosed "prongs" fastened to the rear of the housing(from a bake-lite plate) . Between these "prongs" are four "empty" points allowing additional "screw on" bases. The front glass enclosed meter and recorder allows for the identification and automatic disconnection of any faulty equipment connected to the main power generator. This equipment acts similarly to a modern day circuit breaker found on the electrical circuit boards of residential homes.On the top section of the front panel "ASEA" to the left "Made in Sweden" and to the right "Frabrique en Suede" below this "RIS" below this a graph and next to it two columns of numbers and a pointer for each setkiewa hydro electricity scheme, victorian state electricity commission, relays, generators

Metal lamp, battery powered, with 60 mm lens on front, folding carry handle and spring clip on back for mounting on equipment. There are two 10 mm holes in the bottomD D broad arrow, maker's name, Lamps Electrical No 1lamp, souvenir, equipment

3 copies of booklet, The Electrical Factor in Metabolism (Section 5C) Crystalloid and Colloid Structures in Relation to Electrical Charges, Radiation and Water by W.N.Abbott and E.F.Fowler. 67 pages with black and white photographs.books, technical, chemistry

This unit was designed and manufactured in a factory where many local people of Bacchus Marsh worked. Ref. Historical Notes-Significance Assessment Study ( October 2008)Bakelite tabletop radio,small box,camel-coloured leatherette covered,glass front,three dials,electrical cord,4 vlave reflex super heterodyne, cord attached, incription on set reads "MARSHMAN MUSIC MASTER".Maker's mark in blue print "MARSHMAN MUSIC MASTER" (Inscription on the central area of the glass front of the unit) "BROADCAST" is printed in cream twice in the area of the radio Frequency Band listings.electrical, , bacchus marsh, bakelite, radiogram, bob butler, post war invention, leatherette, technology, 1950 s, small scale radio, heterodyne, cabinet radio, arbee supply c0, civilian radio, manufacturer s drawings, wiring layout, console model

The O'Maras, of Sandringham fishermen. Early mud brick house. Located in Moorabbin and was still there in 1940. The house was situated in Reserve Road, almost opposite Wangara Road, (formerly Cemetery Road). About twelve years ago, (* the writer states no year), there was a vacant block where the house used to be - it was next to a electrical factory. 2x Black and White Photographs. (i) An 1898 photograph showing two men with a fishing boat on the beach. A beach house / shed , paling fence and tall tea-trees are seen in the background. (ii) A large early mud brick house with a tin roof, chimney and a water tank sitting on a block of grassed landWritten on back (i) The O'Maras / Sandringham / fishermen 1898 (ii) Mud brick house at Moorabbin ( house was there in 1940) / Situated in Reserve Road almost opposite Wangara Road / ( formerly Cemetery Road ). About 12 years ago there was a vacant block where the house used to be and it was next to an electrical factory. unsigned undatedthe o'maras, sandringham fisherman, 1898, mud brick house, moorabbin, wangara road, reserve road, electrical factory, early settlers, pioneers, shire of moorabbin, sandringham, beaumaris, mentone, fishermen, dairy farmaers, poultry farmers, market gardeners,

This Morse key (known as a BUG was used from 1944 until April 1946 by R.A.A.F Cpl. William Robert Moffatt 147459 Wireless telegraphist. Used at 55 OBU Birdum and Gorrie Wireless telegraphy stations, and sent over 1.5 million weather forecast groups in 15 months. Then used at 57 OBU Alice Springs Airport until April 1946"I bought thie unit in Melbourne in 1944 while training at Point Cook RAAF Signal school as a wireless telegraphist. With my posting to 55OBU (operational base unit) at Birdum and Gorric Wireless telegraphy Stations broadcasting weather forecasts in morse code for the south west Pacific area, it was used continually, sending over a million and a half weather forecast groups over 15 months. It ended it's career with Aeradio service at Alice Springs airport, (57 QBU), when I was discharged in April 1946." William Robert Moffatt (ex RAAF 147459, Corporal, Wireless Telegraphist.Morse key mounted on metal block with 4 electrical terminals / adjustersThe SUPER AUTO No.4634 Manufactured by Leo G Cohen Melbournebug, morse key, telegraphy

Nineteen copies of a booklet titled The Electrical Factor in Metabolism (Section 2)W.N.Abbott & E.F.Fowlersciences, general, scalebuoy

Light socket connected via electrical cord to ceiling wiring socket Clipsallight socket, ceiling

Birko is an Australian brand, manufacturing and retailing appliances since before the Second World War.Birko travel iron with its original electrical fittings and vinyl case.Birko iron birko, travel irons

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

Instruction - approx. 250 A4 photocopied sheets, loose, titled "General Electric Equipment for Double End Presidents' Conference Committee Type Car furnished Melbourne and Metropolitan Tramways Board Australia". Has a table of contents. Gives a very detailed description of the equipment's, its maintenance including trouble shooting. Has some duplicate copy of static tests at the end of the document.Has the stamp of "Electrical Running Sheds Branch Hanna St" on some sheets.trams, tramways, pcc, controllers, general electric, tram 980

"ASEA wins sub-contract for trams" Typed notes from the August issue of "Electrical Developments" describing the new trams to be built by Commonwealth Engineering, Dandenong, with ASEA as the sub-contractor for electrical equipment. 2 copiestrams, tramways, tramcar construction, tramcar equipment, asea, comeng, mmtb, reports

Photograph 1 shows 5 men (linesmen) on lunch break. (L-R) Stan Hassett, unknown, possibly Charlie Barnett, Jock Petrie, unknown. Photos 2 and 3 show the crew erecting power poles.These photos are significant as they show some Greensborough men at work, and the method of erecting power poles before heavy machinery was used.3 black and white photographs. Subject is electrical linesmen and the erection of electricity poles.sec, linesmen, power poles, state electricity commission, stan hassett, charlie barnett, jock petrie

Ballarat School of Mines student.Framed certificate from the Ballarat School of Mines for a Diploma in Mechanical and Electrical Engineering.ballarat school of mines certificate, mechanical engineering, electrical engineering, e.j. tippett, thomas g. farr, ferguson, geoffrey biddington, alumni

160 page book published in 1959 in Artarmon, N.S.W. by Philips Electrical Industries. nmit

This Hewlett Packard 43120A monitor defribulator electro cardiograph equipment was trialled around 1981/1982 to Gren Sylvester at the Ambulance Officer Training Centre. Having proved successful, it was introduced to non-MICA (Mobile Intensive Care Ambulance) ambulances in Victoria. It was used successfully for at least 15 years and was noted for its reliability and also for its ability to keep working after being dropped. It was later replaced by lighter equipment. Source Ian Gordon AHSV assistant curator 23 March 2016.Monitor Defribulator Electro Cardiograph. Electrical equipmwntr with screen, paddle and carry handleSOUTHCARE UNIT NO 3monitor defribulator electro cardiograph, ambulance equipment

Domestic iron for laundering. Silver with red plastic handle. Electrical cord attached.Hecladomestic items, laundering