The first electrical hearing aids were carbon and were made possible by the invention of the carbon microphone and were made between 1900 and 1939. Carbon, which can be made to amplify electrical current, was used to provide some amplification prior to the invention of vacuum tubes. Later models often came with mechanical (carbon) amplifiers to try to boost the amount of amplification. The carbon microphone was originally invented for use in the telephone and had the properties of being able to modulate current. It is this property that made it useful in the early electrical hearing aids. An example of a carbon hearing aid. This has an imitation tortoise shell casing. Round dark red and black imitation tortoise shell carbon hearing aid with clip for attaching to clothing, and a slide for adjusting the sound (?) a cord split between a plug and a speaker (?)."SONOTONE/REG U.S.P.A./292392/MADE IN U.S.A./ELMSFORD, N.Y." on bottom of unit. "SONOTONE" on plug. "PAT RE 21030" on speaker? deaf children australia, hearing aid, sonotone

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

Advertisement for Welkay Store, furniture and electrical, 45 Main Street Greensborough, 1964Digital copy of newspaper advertisement.main street greensborough, welkay store

Used in the Ballarat School of Mines Electrical Engineering from around 1930-1936.Round glass fronted brass dial mouned on timber stand. Postive and negative terminals below dial. Simi-circular scale, non-linear graduations: 40-80 voltsvoltmeter, scientific instrument, ballarat school of mnes, arthur senior, nalder brothers

A spherical glass vessel with two principles electrodes mounted inside opposing cylindrical extensions. A third mounted in an offset extension. A fourth electrical connection in a branched extension, perpendicular to main axis. scientific instrument, x-ray tube, xray, physics

Solid wooden base with a red and black terminal at one end for electrical connection. Steel rods with space between which generates sparks when connected. Rubber plugs on wooden base. Yellow plate SMB in green. CHEM engraved indicating department it was used in. Serial Number: 97812 Volts: 6 Amps: 5analite, chemistry, terminals, sparks, volts, amperes

Account No. 6113 from the Bendigo Radio Service, Bill Ellen Electrical, dated 31 August 1964. Detailed account for the repair of a Stampco washer. Pink receipt attached for £3/18/-.person, receipts, j w swatton, j w swatton collection, bendigo radio service, bill allen

Invoice from T E Turner ,Electrical Contractor, dated 1st March 71 to Mr A Richardson. Feb 27th , 80/05 referenc 12- 59 pounds, with stapled receipt.bendigo, industry, hardware sales

10 copies of a research paper on The Electrical Factor in the Sedimentation Rate of Blood (Section 3) by W.N.Abbott and E.F.Fowler, with reference to Scalebuoys, reprinted from the New Zealand Medical Journal April 1941.medical

Fan was used by Robert Gardiner,s father during the 1930sElectric fan with four blades enclosed in wire guard. Round metal disk on front of guard. Round base supporting electrical connection. Three metre cord and fittings attached to base.G.E.C.domestic items, cooling, electrical technology, appliances & accessories

Silver coated electrical toaster with rack on top. Both sides pull away to allow bread to rest next to the element. Four knobs and four vents each side. Includes cord.W550 V GR CT3domestic items, cooking

The Warrnambool Woollen Mill was officially opened on November 14th, 1910. The first manager was John E. Bennett. Goods made were " blankets, flannels, articles of universal use". In 1958 the Mill became the first to manufacture electric blankets in Australia. In 2000 the Mill closed after 90 years of operation. This label is of much importance as the Warrnambool Woollen Mill was a major manufacturing business in Warrnambool for 90 years.White label with blue printing adhered to grey cardboard. There is another label on the same card.WARRNAMBOOL Slumba Safe ELECTRICALLY HEATED BLANKET ABSOLUTELY SAFE ECONOMICAL Versatile & Hygienic NUMBER MANUFACTURED BY; WARRNAMBOOL WOOLLEN MILL CO. LIMITED SOUTH WARRNAMBOOLwoollen mill, warrnambool, gaspar's modern print company, electric blankets, john bennett

Joseph Lambert Howard was born in Albury, NSW in 1886 and died in Bendigo, Vic. in 1958. From the years 1915 - 1917 he advertised in the Bendigo Advertiser as an Electrical contractor and supplier of Electrical accessories, operating from the Lyric Building in Charing Cross, Bendigo. He also produced an advertising calendar for 1917.Small metal name plate possible tin - has holes Centre of each side. Front is Gold in parts with brown dirty spots - back shows embossing in reverse with some discoloration. Rectangular in shape 6.5cm x 2.0cm. J.L HOWARD - Electrician Charing Cross Bendigo.bendigo electrician, j.l. howard, charing cross bendigo

Electrical workers working on the Kiewa Hydro Electric Scheme used equipment advertised in this book.The Kiewa Hydro Electric Scheme was built from the late 1940s by the State Electricity Commission of VictoriaSmall red, aqua and white cardboard covered book held together by 2 staples with 112 pages. It includes black and white photos of equipment.Trade Price List / Effective 1st May, 1963kiewa hydro electric scheme. secv. nilsen. switchboard.electricity.

The Cowes Power station was in Cowes west, corner of Chapel Street and Osborne Avenue. James Norman Day was in charge c. 1935.HistoricalPhotocopy of letter from Mr & Mrs Ronald Day, Mermaid Beach, Queensland, sent to the Electrical Engineer, Cowes Council, 1995. and reply to sender. Also copy of photo of equipment in power station.Mr and Mrs Ronald Ernest Daypower station, electricity, james norman day

X-Rays were first discovered on 8 November 1895. By 18 July 1896 staff members of the Ballarat School of Mines (SMB), were experimenting with the exciting new discovery. The history of x-rays began on 8 November 1895 at the University of Wurzburg in Bavaria. The discovery was officially announced on 25 December 1895. The first radiographs in Ballarat were taken at the School of Mines in July 1896 according to the Ballarat School of Mines (SMB) Annual Report. Frederick J. Martell, the Registrar of SMB arranged for the importation of tubes, while John M. Sutherland, an electrician, conducted most of the experiments giving 6 inch, 12 inch and 16 inch sparks respectively. In a short time brilliantly successful results were obtained, with some SMB Roentgen negatives taken at this time still in existence today. Samuel Ernest Figgis, H. R. W. Murphy, D. McDougall, and Frederick J. Martell carried out experiments at the SMB on Saturday evening 18 July 1896, producing 'perfect' negatives of a hand and wrist. A Roentgen Tube and an induction coil giving a two inch spark, the coil being sparked by the SMB's dynamo, were used to obtain these results. The Courier reported that 'the exposure of five minutes was ample' but concluded that 'the length of the exposure will be shortened as experiments proceed.' The Ballarat Courier reported on 20 July 1896 that: "Thanks to the energy of the staff of The School of Mines, Ballarat, and particularly to Messers F.J. Martell and D. McDougall, the assistance of Rontgen X-rays will soon be available, for the relief of suffering humanity, at this institution." Martell was an ardent amateur photographer, and Duncan McDougall's experience as an electrician has enabled the two gentlemen to carry their experiments on to a perfectly successful issue. At first these gentlemen, together with Professor Purdie and Mr W. Huey Steele, conducted a series of experiments by the aid of a Bonetti glass-plate induction machine which had been constructed by Mr McDougall. The results were very good, the various bones of the hand being distinctly visible. The following people were among those who witnessed the first X-ray experiments to be carried out in Ballarat. Andrew Anderson, President of the School of Mines, a large number of ladies and gentlemen, the medical profession Dr Edward Champion (1867-1929) Dr Gerald Eugene Cussen (1888-1943) Dr William Edward Davies (1868-1928) Dr Charles William Henry hardy (1861-1941) Dr Edward Kenneth Herring(1864-1922) Dr Joseph Lalor (1859-1907) Dr James Thomas Mitchell (1856-1945) Dr Edward Graham Ochiltree (1857-1896) Dr Robert Denham Pinnock (1849-1902) Dr Joseph Francis Usher (c1832-1909) Dr Grace Vale (nk-1933). The staff of SMB Professor Alfred Mica Smith Professor D. J. Dawbarn Mr. F. J. Martell. (http://guerin.ballarat.edu.au/aasp/is/library/collections/art_history/honour-roll/honourroll_X-Ray_pioneers.shtml)Two men, one seated, one standing standing in a room with early electrical equipment. They are conducting pioneer X-rays at the Ballarat School of Mines in 1896. Seated on the left is John Waters Sutherland.A bromide of this images states "Experimenting with X-rays, 1896"ballarat school of mines, x-ray, xray, john sutherland, sutherland, electricity, photography, foto, roentgen tube, medical

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

Steel, aluminium, plastic and copper. Transformer used to reduce current from 240 to 110 volt for use with tenetyps machine. Iten painted in non reflective grey. 6 electrical plugs on front.Label on back of item - Gordon & Joy Garbott. 64-66 Poldfett Street, Darystock. Vic 3992signals, transformer

From the Betty McPhee sewing collectionReel of cream rayon twine, used in sewing etc. Reel was formerly used for winding copper wire used in the electrical industry by Henley London. Reel is imprinted on both ends with Henley markings.DCO Copper Wire|20 swg 036 dia... 1lb Netthandcrafts, equipment

From the late 1920s several brands of irons, including Hotpoint and Light' N Easy were manufactured in Australia by the Australian General Electric Co. Ltd. Light' N Easy irons were marketed as a versatile iron, small and light enough to be taken with you if you needed to travel away from home.This iron is representative of electrical appliances developed under licence in Australia from the late 1920s onwards.Small yellow steam iron. There are controls and a water level indicator on the side of the iron. There are 25 steam vents in the base. Steam and dry iron with surge of steam. A 3 metre electrical cord is attached.Label: " General Electric Housewares Pty Ltd. Vic/ Nottinghill Melbourne 3166/ 700 Watts/ APP NO. V79008 Cat 04/06 240 Voltsdomestic appliances, light 'easy irons

Two pages of typed notes titled - Electrically Welded Single Strand Barb Wire. The notes mention the advantages of the single strand electrically welded barb wire over the ordinary twisted barb wire of two strands. Advantages include less weight in the fence and for freight, less stretching, barbs are at fight angles to the wire and rust does not attack the welded barb wire as it is not bent which can cause the galvanising to crack. The welding helps to keep the rust out.sciences, instruments - general, scalebuoy, bill ashman collection - correspondence, electrically welded single strand barb wire, university of melbourne

Demonstrates training of tram drivers in Bendigo. Similar documents would have been used for Ballarat and Geelong.Instructions - 19 sheets (last sheet missing), stapled multiple times on the left hand edge, providing detailed instructions and guidance to trainee motormen. Has reference to T1F controllers, K36J controllers and instructions for Safety Cars (Birney). Has diagrams for electrical paths. Has a table of contents, covers electrical, faults, braking, failures of braking, emergency braking, dead man controls, signal instructions for Bendigo and General Instructions. C1940. See also Reg Item 3486 for another version. trams, tramways, sec, instructions, traffic staff, motormen, bendigo, training, signals

Established in 1897, Baker and Woods were initially electricians. The property in Hargreaves was taken over by a saddler and Baker and Woods moved to premises at 313 Hargreaves Street. The business expanded to include photographic equipment, phonographs and phot development. In 1903, Baker and Woods were responsible for converting the gas lighting in the Bendigo Town Hall to electricity. A fire caused by a short circuit caused extensive damage to the building in 1914.Baker & Woods Electrical Engineers and Photo Stock Dealers. Cream paper with Black print. At the top Hargreaves Street, Bendigo, Docket 221. Bought of Baker & Woods, Electrical Engineers and Photo Stock Dealers. Written in Pencil on the Docket is *Prairie. July 18 1914. Mr J. R. Stephens. Items listed:- Developing Film 1/6, Printing 24 Postcards 3/- 6/, postage -4p = 7/10. On the back written in blue biro is - 1290B. Box 625business, retail, photography, hargreaves street bendigo. baker & woods.