Although Lee DeForest invented the triode vacuum  in 1906, it was not employed in hearing aids until 1921. The first hearing aid using a vacuum tube was purported to have been made by Earl C. Hanson. He called his hearing aid the Vactuphone. It used one small peanut tube (below right) to amplify the output of a carbon hearing aid. The Globe Hearing Aid Company and Western Electric collaborated to manufacture the Vactuphone. By the early 1940s, Raytheon had developed miniature vacuum tubes. It was these miniature vacuum tubes that made body-worn hearing aids a reality. Unfortunately, the power requirements of these aids made it necessary to use two relatively large batteries—an "A" battery to power the filaments of the vacuum tubes and a "B" battery to supply the high-voltage for the plate current. The batteries were worn external to the hearing aid itself and the name "Two-piece" hearing aid was used to describe them. Until about 1945 "Two-piece" hearing aids were the norm. However, improved vacuum tube design reduced current requirements. As a result, battery manufacturers were able to reduce the size of the batteries used in hearing aids. At the same time, electronic components were also being miniaturized. This allowed the hearing aid manufacturers to design hearing aids with internal batteries. After 1945, these "One-piece" hearing aids quickly replaced the more cumbersome "Two-piece" hearing aids. With continuing improvements in both batteries and components, hearing aids continued to reduce in size until 1953 when the vacuum tube was suddenly supplanted by the transistor.Fawn plastic hearing aid with metal clip on back and wires leading from the bottom. Made in the USA, sold by Angus & Coote as the Sole Australian Agents. The Model is the Sonotone 700. Two dials one on each of the top corners."ANGUS & COOTE/Sole Australian/Agents/C D C" Printed in black on the back, top left hand corner. "SONOTONE/700/SERIAL NO/843218/MAD IN U.S.A./SEE PATENT NOTICE/IN INSTRUCTION BOOK" imprinted on back, centre middle.deaf children australia, hearing aid, sonotone hearing aid, sonotone 700, angus & coote

A manual telephone exchange, manufactured by British Ericson, History Originally in use at Cohuna. When Cohuna was converted to automatic dialing this exchange was relocated to Harcourt, to become the third and last in a bank of three exchanges. At this time Harcourt exchange was expanded to 260 lines. It was connected to the district central exchange at Castlemaine. Operated by mains power with battery back-up. Harcourt exchange was operated by Betty McLean, Miss Mitchell, Josie Hogarth, Mr. & Mrs. Heighway, Bill & Valerie Milford, Irene Bolitho and others. Decommissioned approx. 1970. Incoming calls prompted the fall of a shutter. The operator made the connection by plugging the line into the number requested. While responding to calls the operator needed her hands free to jot down the billing particulars or to write out each telegram. Nearby stood pigeonholes with various items of stationary. Many telegrams were received each day, particularly advising fruit growers on interstate markets. Most telegrams were phoned through by the operator. This exchange was restored in 2004 - 2005 by Trevor Grant.. Many people relate to this exchange. It is a survivor of the pre-electronic era when ‘telephonist’ was a common occupation. A vital element in the communications between households and between district orchardists and their suppliers and clients.A manual telephone exchange, manufactured by British Ericson complete with operator hands-free headset/earphones and speaker mouthpiece. Wooden case with one hundred shutters and sockets. Accommodates twelve lines with extension leads with associated switches. Operated by mains power with battery back-up. Decommissioned approx. 1970. Incoming calls prompted the fall of a shutter. The operator made the connection by plugging the line into the number requested. This exchange was restored in 2004 - 2005 by Trevor Grant.

Covers the development of the battery tramway, depot, battery tramcar operations, steam locomotives, horse trams, steam trams, track, managers of the private company, ESCo purchase, electric trams, trams from Melbourne, SEC, description and extension to North Bendigo. May have been copied from another source.Yields information about the history of tramway operations in Bendigo and the tramcars.Handwritten copy of an article or an original article, titled "Bendigo Tramways 1890 - 1942" Eleven pages. Contained within Reg Item 5485 - Service Exercise Book, black covers, with label, red binding titled "No. 2 - Ballarat Tramways & S.E.C. Systems". trams, tramways, bendigo, battery trams, steam trams, sec, esco

Copy of a page titled New Chum Reef (Continued). Listed is the name of Mine, Depth, Production, Dates, Plant, Machinery, Comments and Position. Mines listed are:- Little Chum, Young Chum, Craven, Garibaldi, Ellesmere, South Old Chum, New Chum Consolidated, North Ellesmere, New Chum United, Abraham Lincoln Battery, Lansell's 222, Fortuna Battery, Lansell's Fortuna, Lazarus, Lazarus, West End and Pioneer,bendigo, history, long gully history group, the long gully history group - new chum reef mine stats, little chum, young chum, craven, garibaldi, ellesmere, south old chum, new chum consolidated, north ellesmere, new chum united, mt alvernia hospital, abraham lincoln battery, lansell's 222, fortuna battery, fortuna, private tunnel, lansell's fortuna, lunt, lazarus, chum hill, lazarus, west end, army survey unit, pioneer

Brass, internal battery powered lamp, with swivel mounted brass rod carrying handle and a clip on back for mounting, 56 mm lamp on front and a press on/off switch on topD D broad arrow, Lamps Electric No 1, Kempthorne Aust, 1943lamp, electric, battery, ww2

Diary deals mainly with the period from 8 April 1915 until the landing at Gallipoli on 25 April 1915. Last lines tell of the unloading and setting up of guns on that day. Collins died of wounds at Gallipoli on 20th June 1915. Black, softcovered notebook in canvas pouch. Diary of William Collins (1563 - 2nd Field Artillery Brigade, Battery 4). Includes nine letters written by diarist to his family.ww1, gallipoli, letters, diaries, william raymond collins, 2 field artillery brigade

Five black and white photographs of a sand dump, possibly battery sand dump from Monument Hill Gold Mine. Photos almost identical to others previously catalogued in this collection.bendigo, business, mccoll, rankin & stanistreet

BLACK & WHITE PHOTOGRAPH OF PORT PHILLIP MINE, GENERAL VIEW SHOWING WORKINGS, POPPET HEADS, BATTERY, RAIL LINES AND MULLOCK HEAPS SEE ALSO, PHOTO IN ITEM 3255local history, photography, photographs, mining

A brown coloured cardboard cover with black information on the front. Above the Commonwealth of Australia insignie written in ink and circled reads Pick Up Batteries. The booklet is covered with a plastic cover.commonwealth of australia, department of supply, stores and transport branch, 2lt lawrence bemsley dawson, 18615, royal australian corps of signals, 557 signal troop, 110 signal squadron, 561 signal troop

This gun sight was brought home from WWI (1914-1918) by members of the 13th Battery 5th Field Artillery Brigade (Albury Battery) as a souvenir of its action in the first battle of Bullecourt April 1917. On one occasion during the battle the Battery was surrounded by a German counter attack. They dragged their guns out of the gun pits and continued firing to the flanks and rear and supported the Australian counter penetration attack which restored the situation. After the war a recreational reserve in Albury NSW was named Noreuil Park after the French village near where the action occurred.A rare object with significant connection to Albury NSW and its citizen soldiers who served with the AIF in WWI (1914-1918). The engraving gives it close association with the recreational park in Albury named after the French village of Noreuil and honouring the soldiers who fought there with great courage. Range drum portion of the sighting mechanism from an 18 Pounder field gun made of brass and other metals. The object is engraved with the word NOREUIL and the date 2.4.17.Serial No 5459; and NOREUIL 2.4.17gun sight, noreuil, albury, 13th battery

Taken on the 31st of August ,1918, this photograph depicts Gunner Wilson, Lieutenant Driscoll, and Lieutenant Clark (facing camera) of the 12th Battery of Australian Field Artillery, choosing a site for new battery positions, as members of the 52nd Australian Battalion move past to a new sector north of the Somme, before Mont St Quentin.The Battle of Mont St Quentin commenced on the 31st of August 1918 and ended on the 3rd of September 1918. The battle saw Australian troops storm, seize and hold the key height of Mont St Quentin (overlooking Peronne), a pivotal German defensive position on the line of the Somme.Black and white rectangular reproduced photograph on matte photographic paperReverse: 5144/military album, beechworth, burke museum, ww2, world war two, france, somme, 12th battery of australian field artillery, 52nd australian battalion, military, mont st quentin

Back pack used to carry portable two-way radios and spare batteries to remote bushfiresCanvas backpackFCV Radio Labbushfire

Young barefooted child with bucket and spade at St. George Battery dam. Child is Lindsay McDonaldstawell

Set of two instructions, duplicated foolscap sheets. Both signed by H. A Wilcox, General Manager. .1 - "Rules and Instructions for Gripmen and Conductors re Electric Lighting of cars and dummies", notes care for lamps, battery leads, failure, electric shock (7 volts) and cautions. Two sheets, Two copies held. Dated 1/3/19. .2 - "Edison Car lighting system - rules for the guidance of employees" - 4 sheets with brass pin in top left hand corner, giving details of connecting the batteries for charging, charging, battery car, methodology of using the rheostat, cleaning, jumper cables, reports, faults and contact electrical foreman Mr. T Dawe. Not dated.trams, tramways, lights, cable trams, batterymen, equipment

BHS CollectionBlack and white photo of the squared oregon poppet legs , braces, wooden cage framework, guides for the skids and safety clamps of the cages of the Hercules Mine. Beside the photo is a printed description of the photo. In the bottom right corner is a printed description titled Interior of a Mine Battery. Written above it is Kocks Pioneer. Inside View of Kock's Battery. There is no photo. Descriptions and photo are mounted on pale blue paper which is then mounted on brown card and laminated.bendigo, history, long gully history group, the long gully history group - hercules mine & inside view of kock's battery, sheepshead line of reef, kock's pioneer, lincoln mine, lansell's big blue battery, quartz hill, whiffly tables, the chinese

Denis Gibbons (1937 – 2011) Trained with the Australian Army, before travelling to Vietnam in January 1966, Denis stayed with the 1st Australian Task Force in Nui Dat working as a photographer. For almost five years Gibbons toured with nine Australian infantry battalions, posting compelling war images from within many combat zones before being flown out in late November 1970 after sustaining injuries. The images held within the National Vietnam Veterans Museum make up the Gibbons Collection.A black and white photograph of 104 Battery RAA, Gnr Leo Adams, adjust the sight of the 105mm gun while Sgt Peter Tilbrook contemplates the fire mission at Fire Support Base "Betty" . The Batter was supporting 4 RAR/NZ (ANZAC) Battallion. The battery was in action against NVA/VietCong sappers attempting to attack the giant US supply depot at Long Binh in Bien Hoa Province during the Tet Offensive 1969photograph, 104 battery raa, gnr leo adams, sgt peter tilbrook, fire base betty, 4 rar nz, long binh, bien hoa province, tet offensive, 1969, gibbons collection catalogue, royal australian airforce, 105mm howitzer, 4 rar/nz (anzac), us supply depot, denis gibbons

"The State Battery was the central component in the gold mining of this area from the 1920s. The battery crushed the gold bearing quartz extracted from the mines and was a sizeable weatherboard building enclosing the engine and stampers. All that now remains are the bases for the machinery that comprised the battery, one timber and a couple of concrete bases and the nearby dam, which supplied water. However the historic significance of the site remains and is enhanced by the Queenstown Cemetery on the other side of Smiths Gully Road". - Bick Study 1922 This site is now the Peter Franke Reserve and is managed by Parks Victoria Photo Source: The Leader, Nov. 2nd, 1929This photo forms part of a collection of photographs gathered by the Shire of Eltham for their centenary project book,"Pioneers and Painters: 100 years of the Shire of Eltham" by Alan Marshall (1971). The collection of over 500 images is held in partnership between Eltham District Historical Society and Yarra Plenty Regional Library (Eltham Library) and is now formally known as the 'The Shire of Eltham Pioneers Photograph Collection.' It is significant in being the first community sourced collection representing the places and people of the Shire's first one hundred years.Digital imagesepp, shire of eltham pioneers photograph collection, queenstown, st andrews, gold mining, smiths gully

This photograph shows men working goldfields - possibly the battery mines at Club Terrace or near Bendoc? Clarkeville?This item is a pictorial record of the gold mining history of East Gippsland.A black / white postcard / photograph of a group of miners in the foreground with horses an wagons in the background on gold fields.gold-mining-east-gippsland

Part of a group of WW1 photographs including AIF camp, 1914, officers of T.M.s, Light Horse Battery.Black & white photograph of a soldier in uniform, standing near a large mantle piece, with no insignia or colour patches. postcards, photographs, world war 1, light horse, william smith

A section of the former Sunbury Power House in the battery shed with machinery used to generate electricity for the Sunbury township.B/W photograph of an interior view of the Sunbury Power SupplyNumbers on back: 4�sunbury power supply, george evans collection

Warrnambool had an active group of military volunteers prepared to defend the coast of Victoria.This photograph is historically significant to Warrnambool's military history.Photograph, sepia, mounted on brown card, depicting Warrnambool Battery opening at Flagstaff Hill and a group of uniformed artillery men around the cannon. The background had the Lower Lighthouse. Inscription on back.Handwritten text on back: "1887"flagstaff hill, warrnambool, maritime museum, maritime village, great ocean road, shipwreck coast, militia, volunteer corps, defence, army, military, cannon

This is a service calling card from L.J.Kermond, a radio and electrical dealer and a servicer of these items. He operated from 4 Lava Street and later from 153A Lava Street and the dates found for this business are the 1950s and 60s. He later operated from Fairy Street and was well known in the district for his work in outside broadcast.This card is of interest as an example of the type used by servicing departments of business in Warrnambool in the 1950s and 60s. This is a grey coloured card (lightweight cardboard) used as a service call card by the radio and electrical service firm of L.J.Kermond. It is printed in blue and black type and has a red image of a battery and a valve. ‘Re-Valve with L.J.Kermond, 4 Lava Street, Warrnambool, Telephone Warr. 696, …..19. Mr ……., We called to-day at a.m./p.m. to service your ….. Will you kindly notify us when it will be convenient to call again?’l.j.kermond, warrnambool, kermonds electrical warrnambool, kermonds radio