Showing 362 items
matching dial
-
Whitehorse Historical Society Inc.
Audio - Radio
Used by Mrs Johns of Orient Ave Mitcham about 30 years ago.Battery operated transistor portable radio. Enclosed in a brown leather case with handle on top. Opens at back for placement of batteries. Metal front, glass dial with tuning and volume knobs.AWA RADIOLA Transistor Eight.communication, radio -
Parks Victoria - Wilsons Promontory Lightstation
Clock
The brass wall clock retains its key. It was provided by the Department of Shipping and Transport in about 1900 and is original to the lightstation. It was mounted in the watchroom, a small extension at the front of the lighthouse (later radar station), where lightkeepers completed many of their reports and recorded radio schedules, weather observations, distress calls and other data. Good, reliable clocks were also essential for maintaining a strict roster of hours for winding the clockwork mechanism that kept the lens active. The name of the clock’s manufacturer has not been determined. More specifically it was used for logging radio schedules that were made at five minutes to midday, everyday, and for recording the times of weather observations, distress and any other calls that came in. AMSA notes that ‘Lightkeepers who used this clock were said to have polished and wound it every week while it was in use until the 1990s when its otherwise impeccable time keeping mechanisms finally became inaccurate’.The brass clock at Wilsons Promontory illustrates the importance of timekeeping in a nineteenth century lighthouse. Despite its slightly chipped face, the timepiece has first level contributory significance for its historic association with the watch room and confirmed provenance. The significance of this clock also lies with its complete provenance..1. Brass clock with a circular white face and black roman numerals. Three brackets at back to attach to wall. Face of clock is covered by a hinged glass cover with a fastener. .2. key. Roman numerals on face of main clock. "1-12" On inner dial "10-20-30-40-50-60" -
Mont De Lancey
Domestic object - Clock, Waterbury Clock Co. USA, c1857
Used by Harold and Jean ParkerAntique wooden mantle clock made in USA with an Australian made Duff brand oak case with a plain angled top with round shaped pillar styled sides. It has a white ceramic dial face with black digits and black metal hands. The dial is covered by a glass and gold trimmed covering that may be opened on the right side. Inside the case is a Waterbury Clock Co of USA key and the internal workings are visible. It is not in working order.Duff brand brass plaque on back of cover. Key has Waterbury Clock co USA stamped on it.clocks, timepieces, clock components, clock keys, mantle clocks -
Learmonth and District Historical Society Inc.
Mantle Clock, "circa 1910"
Founded in1903 when William E.Sessions and some of his family took over E.N.Welch Co. in Forestville. E.N.Welch Manufacturing Company used a local foundry to produce their castings. The foundry owner's son,William E.Sessions, took an interest in horology and ,along with other Sessions family members, bought controlling interest in the E.N.Welch Company., which was a joint stock corporation formed July 6th 1864 to succeed an older private firm who made clocks under the name of E.N.Welch. Elisha N. Welch (1809-1887),had been making clocks at a factory on East Main Street Forestville Conneticut after taking over J.C.Browns bankrupt business around 1856.Under William Sessions management the firm produced all components of their clocks including movements,cases,dials,artworks and castings.In 1930 the company expanded to produce electric clocks,timers for radios,televisions and other devices as well as their traditional brass mechanicial movements.In 1956 Sessions was absorbed by another company while retaining the name and in 1969 the business went into liquidation.Clock is made of black wood with Corinthian style columns,three set on each front corner. These are black metal, and show remains of gilt paint on top of columns.On the base of the clock is carved decoration with similar carvings on each of the four corners of square around clock face.Dial is cream with Roman numerals. the hands are set in gilt centre piece.Below the 12 is the name WELCH.The glass dial cover is edged in gilt. It is spring wound and has settings-day/night,1/2 hour strike(hour on gong -1/2 0n bell), Cathederal Gong, turn back hands. THE SESSIONS CLOCK COMPANY. Successors to the E.N.WELCH MANUFACTURING COMPANY.Forestville.Conneticut.United States of America.mantle clock, the sessions clock company, forestville conneticut united states of america -
National Vietnam Veterans Museum (NVVM)
Equipment - Equipment, Army, Tellurometer
A tellurometer on a tripod. the tellurometer is a box shaped with a black front with severla dials and guages on it. the colour of the box is green. There is also a carry handle on top of the box. The Tellurometer is positioned on a three legged tripod131 division, tellurometer, tripod -
Anglesea and District Historical Society
Digital Watch - Antique
Nickel/Chrome plate. Patent No 104593. Two dials. Wristband added later? (1930's wristband?). In box marked 'F Band & Son Geelong'. Attached to band of different era.watch, digital -
Clunes Museum
Functional object - POCKET WATCH
ROUND SILVER PLATED POCKET WATCH, BLACK ROMAN NUMERALS ON WHITE DIAL, SILVER HOUR AND MINUTE HANDS WATCH MAY BE REMOVED FROM SILVER CASE WOUND WITH KEY. [NO KEY]horology, mclennan, local history -
National Wool Museum
Instrument - PH Meter For Use in Woollen Mill, c.1940
A complex instrument used to determine the pH factor of liquid samples, in this case, dyes. Without this instrument to measure the pH level of dyes before use, it would be impossible to ensure successful and repeatable results when dyeing wool.pH meter contained within dark wooden box, opened with two brass clasps. Contains dials, an electrode, glass bottle of potassium chloride and instructions for use on card inside lid.textile testing, dyeing, woollen mill, ph, scientific instument -
City of Moorabbin Historical Society (Operating the Box Cottage Museum)
Scales,Spring Balnce Imperial ‘Household’ Salter, 20thC
In the 18th century, spring scales appeared. To produce these scales, a manufacturer would use the resistance of a spring to calculate weights, which could be read automatically on the scale’s face. The ease of use of spring scales over balance scales is what led most post offices to outfit their clerks with spring postal scales. One of the most common types of spring scales was the kitchen scale—also known as a family or dial scale. Designed for horizontal surfaces, these scales used the weight of goods in a pan at the top of the scale to force the spring down. Such scales were common in early-20th-century households and were sold by Sears and Montgomery Ward. Many had flat weighing surfaces but some were topped by shallow pans. Companies such as Salters, Chatillon, and Fairbanks made both. SALTER HOUSEWARES began in the late 1760 in the village of Bilston, England. At this time Richard Salter, a spring maker, began making 'pocket steelyards', a scale similar to the fisherman's scale of today. By 1825 his nephew George had taken over the company, which became known as George Salter & Co. and later established a large, well equipped manufacturing site in the town of West Bromwich. The business thrived throughout the 1900s, and in 1972 the company was purchased by Staveley Industries Plc. In 2002, the management team at Salter Housewares Ltd, backed by Barclays Private Equity, bought the company out from the group, to concentrate on its consumer businesses. In 2004 was sold to the US-based HoMedics company, and in 2006, Salter Housewares USA and Taylor Precision Products Inc (also owned by HoMedics) merged. Salter Brand No. 44 Household Spring Balance Kitchen Scales made of green painted metal with a large clock face dial marked in 1oz graduations and with a shallow metal bowl placed on the flat top connected to the mechanism. An adjustable screw tightened or loosened the spring to bring the pointer to zero, prior to adding the material to be weighed.. A common piece of kitchen equipment as most families used this type of scale when measuring goods for cooking or storing.On Clock face ; NO. 44 / HOUSEHOLD SCALE / TO WEIGH 14LB X 1OZ / Pro. Pat. No. 30819 / 32 / MADE IN ENGLAND / SALTER / S in trademark rope with arrow market gardeners, early settlers, fruit, vegetables, farmers, cooking, recipes, scales, weights, measures, brass, balance beam, moorabbin, cheltenham, bentleigh, kitchen scales, dairy products, cereals, wheat flour, salter housewares pty ltd, west bromwich england -
Nhill Aviation Heritage Centre
Navigation Computer
This type of instrument typically used by pilots and navigators for quick calculations of Air Speed and Wind Drift.hand operated navigation computer. Rotating scale on the front panel and a scroll type scale on the inner panel with a winder knob on the right side. Front panel is hinged at the top and bottom has two curved thigh pads.Indent No. G6B/145 RAAF Serial No. WG/2967* I.C.A.N. in center of front dial COMPUTER NAVIGATIONAL Ml. III D. -
Forests Commission Retired Personnel Association (FCRPA)
Telescope used in FCV fire towers - ex military, c 1940s
Victoria once had well over one hundred fire lookouts and firetowers. Fire lookouts, or observation posts, were often just a clearing on a hill or a vantage point, whereas firetowers were definite structures. Many were established by the Forests Commission Victoria (FCV) in the 1920s, but the network was expanded rapidly in response to recommendations of the Stretton Royal Commission after the 1939 Black Friday bushfires. When a fire or smoke was spotted from the tower a bearing was taken with the alidade and radioed or telephoned into the district office. It was then cross referenced with bearings from other towers on a large wall map to give a "fix" on the fire location Alidades and telescopes were used in the post war period but were replaced with a much simpler map table and reference string suspended from the centre of the tower cabin.Uncommon usageTelescope used in fire towers Ex military Kern Company NY Argus made in USA Adjustment lens, dials and focus ring Small spirit levelbushfire, forests commission victoria (fcv) -
Bendigo Military Museum
Memorabilia - RADIO, 1960’s
The item was bought in south Vietnam by Wesley BERTUCH during hi service there. Refer Cat No 1664.2 for details.Large Transistor Radio Black with chrome coloured face handle on top four dials on the front Rear has World timetable adjustable five sockets for various points Band 9 Transister“HI FI Sound Deluxe National Panasonic”personal effects, communications, radio, bertuch -
Wodonga & District Historical Society Inc
Functional object - Victorian Railways Scales for Weighing up to 25 kg
The Victorian Railways scales were donated by a resident of Wodonga, Victoria, and may have been used in the Wodonga train station. The Wodonga train line and train station opened in November 1873 when the section of the line from Wangaratta to Wodonga was completed. The expansion of Victorian Railways to the northeast of Victoria occurred after the Victorian Government took over the railways in 1867 and the trains serviced large towns such as Seymour, Wangaratta and Wodonga, as well as smaller towns along the way.The Victorian Railways weighing scales has local significance as it was donated by a resident of Wodonga, as well as state significance as an example of the equipment used by the Victorian Railways. Green painted cast iron Victorian Railways scales for weighing up to 25 kg. Rectangular weighing plate above a circular aluminium dial with the weights and 'V.R.' is engraved in black on the front of the scales."V.R." in black on the front of the scales "TO WEIGH / 25 kg. X 250 g." in black on the front of the scales "1714" engraved on a small iron plate screwed onto the front of the base of the scales.victorian railways weighing scales, v.r. weighing scales, railways scales, weighing scales, victorian railways, v.r., vr -
City of Moorabbin Historical Society (Operating the Box Cottage Museum)
Scales, Imperial, Spring, 'Salter Household Scale’ 28lb, c1920
In the 18th century, spring scales appeared. To produce these scales, a manufacturer would use the resistance of a spring to calculate weights, which could be read automatically on the scale’s face. The ease of use of spring scales over balance scales is what led most post offices to outfit their clerks with spring postal scales. One of the most common types of spring scales was the kitchen scale—also known as a family or dial scale. Designed for horizontal surfaces, these scales used the weight of goods in a pan at the top of the scale to force the spring down. Such scales were common in early-20th-century households and were sold by Sears and Montgomery Ward. Many had flat weighing surfaces but some were topped by shallow pans. Companies such as Salters, Chatillon, and Fairbanks made both. SALTER HOUSEWARES began in the late 1760 in the village of Bilston, England. At this time Richard Salter, a spring maker, began making 'pocket steelyards', a scale similar to the fisherman's scale of today. By 1825 his nephew George had taken over the company, which became known as George Salter & Co. and later established a large, well equipped manufacturing site in the town of West Bromwich. The business thrived throughout the 1900s, and in 1972 the company was purchased by Staveley Industries Plc. In 2002, the management team at Salter Housewares Ltd, backed by Barclays Private Equity, bought the company out from the group, to concentrate on its consumer businesses. In 2004 was sold to the US-based HoMedics company, and in 2006, Salter Housewares USA and Taylor Precision Products Inc (also owned by HoMedics) merged.Salter Brand No. 46 Household Spring Balance Kitchen Scales made of green painted metal with a white large clock face dial marked in 1oz graduations and with a shallow metal bowl placed on the flat top connected to the mechanism. An adjustable screw tightened or loosened the spring to bring the pointer to zero, prior to adding the material to be weighed.. A common piece of kitchen equipment as most families used this type of scale when measuring goods for cooking or storing. HOUSEHOLD SCALE / NO. 46 / SALTER / TO WEIGH 28 LB / ( rope & arrow TM) BRITISH MADE Base rope & anchor S (trade mark) weights, measures, shops, scales. balances, grocery stores, early settlers, moorabbin, bentleigh, cheltenham, salter housewares pty ltd, west bromwich, england, salter george, salter richard, bilston england -
Bendigo Historical Society Inc.
Document - RADIO LOG CARD
Bifold grey card -Radio Log Card - issued by Hartley's sports stores Mitchell Street Bendigo. The card lists radio stations across Australia including the dial numbers, wave length and location.business, retail, hartleys -
Royal District Nursing Service (now known as Bolton Clarke)
Photograph - Photograph, black and white, c.1967
This photograph is taken in the Sterilizing room in the Royal District Nursing Service (RDNS) Footscray Centre. Sister Short is closing the door of the Autoclave to sterilize equipment and dressings which will then be used by a RDNS Sister when she is visiting a patient in the community. Sterilizing of equipment and dressings were carried out at each RDNS Centre. Royal District Nursing Service (RDNS) supplied sterilized equipment, such as ready set up catheter trays and dressing trays, as well as dressing packs for their trained staff (Sisters) to take to the home when attending to specific patient care. When the Sisters returned to the Centre they washed and set up the trays again ready for re-sterilization. Each RDNS Centre had an Autoclave room and equipment and dressings were sterilized each day.Black and white photograph showing Royal District Nursing Service (RDNS), Sister Margaret Short, who has short dark hair, and is wearing a white gown over her uniform, with the grey peaks seen. She is using the Autoclave in the Sterilizing room. The tall rectangular metal sterilizer stands in the centre of the photograph. There are several small dials and a larger square dial on its upper left, with a long encased thermometer in the centre and a large round dial to its right. Below this is the partly open large metal door of the sterilizing section. A thick horizontal metal piece runs from the left side of the sterilizer, across, and attached at the centre, of the door. Sister Short has her left hand on the turning bar attached to the centre section, and her right hand is on the locking section as she closes the door. Below the door are two switches and several small dials. To the left of the sterilizer is a cabinet, and to the right of Sister Short, eight small wrapped dressing packs are on a shelf. At the rear of the photograph the wall goes halfway up, with windows above.Photographer's Stamp. Quote No. GX 12 Handwritten informationroyal district nursing service, rdns, footscray centre, sterilizing, sister margaret short -
Rutherglen Historical Society
Weighing machine, Reliance Automatic Personal Scale, Before 1975
Thought to have been used at Rutherglen Railway StationStep-on commercial weighing machine, clock face showing weight in stones, coin operated (pennies). Plate under face listing average weights. Dunlop rubber mat on platform. Manufactured. Painted enamel, metal rim round glass over faceNumbers around dial. "Penny" "Check Your Health / The Reliance / Automatic Personal Scale / British Made / in / Leicester" / "Zero". On back: "1081"scales, personal weight -
National Vietnam Veterans Museum (NVVM)
Equipment - Equipment, RAN, Engine Telegraph
A brass engine telegraph with a red dial. On white background there are several areas divided by a black line which has writing in black in each area. This equipment for liaising from bridge to engine room. this is on a brass stand.engine telegraph, ran, cerberus collection -
Clunes Museum
Administrative record - DOCUMENTS, UNKNOWN
Nil.1 International time recorder ribbons in cardboard box .2 Instruction sheet "International Dial Recorder, printed in USA .3 Interknit Hosiery Co. Ltd., Clunes pay slips for Holiday Pay 1954.1 printed in black ink 1&1/4" x 4" International Time Recorder Ribbons operating instructions, interknit hosiery co. ltd., bundy clock -
City of Greater Bendigo - Civic Collection
Instrument - Theodolite, Cooke, Troughton & Simms, c 1940
Theodolites are a highly accurate instrument that measures angles between designated visible points in the horizontal and vertical planes. The theodolite has a long history, with the term first found in 1571 in a surveying textbook 'A geometric practice named Pantometria' by Leonard Digges. (source https://en.wikipedia.org/wiki/Theodolite). Cooke Troughton & Simms began when John Troughton starting selling products in Fleet Street, London in 1782. He went into partnership with his brother Edward in 1807 who expanded the business considerably. William Simms, a former apprentice with the company was taken as a partner and then manager after Edward died in 1835 and the company became Troughton & Simms. By 1887 the company was able to produce all the parts necessary for their instruments and the company employed nearly 200 people and was one of the most well respected firms of instrument makers of the 1800's. James Simms, son of William who had inherited the company died in 1915 and the company was turned into a limited liability company by his two sons William and James. Things however were not so easy for the two sons and in 1922 the business was brought out by their rival T. Cooke & Sons becoming Cooke, Troughton & Simms. Theodolites are used by surveyors as part of their everyday work and although there is no specific information regarding the provenance of this particular one it is assumed it was used locally by the City of Bendigo and / or the Lands Department.A grey theodolite no 39161 made by Cooke, Thoughton & Simms. Various moving parts showing signs of extensive use particularly on the uprights on the main body and around knobs and dials where the paint is worn back to brass.Cooke, Thoughton & Simms Ltd / York. England / No 39161. Sticker; DPS - Asset No / (barcode) / 0010173city of greater bendigo administration item, lands and survey department bendigo -
Montmorency/Eltham RSL Sub Branch
Instrument - Sight, Mortar, Mk1, 3 Inch, WWII, 1941
Manufactured during World War II Manufactured during WWIIWWII 3 inch Mortar sight, Mk1, Lensatic. Dark green coloured brass metal body with brass fittings. Aluminium coloured circular dial with black painted numeric (zero to 180 degrees) and alphabetic (left and right) markings. Silver coloured butterfly nut fitting on lower body for sliding clamp adjustment. Steel screws and nut fittings. Two clear glass levelling bubbles are provided. Left and right adjustment dials, locking clamp provided for fitting of sight to a circular post fitting.SAR 1941 24-36 DD02124-3 TO LOCK (with direction arrow) L R (with arrow point marking) 0 to 9 R 0 to 9 L 0 to 180 R 0 to 180 L 210 GRS SEC CHARGE II I MR 2454 graticule markings 1400 to 600 Graticule markings 2700 to 10003 inch, mortor, sight, australian defence forces, ww ii -
Bendigo Historical Society Inc.
Domestic Object - JAMES MURRAY AND CO. ONE HANDED CLOCK
Wall clock in a round cedar case with a single black stationery hour hand and moving brass dial, black Roman numerals surrounded by a brass outer ring with a stippled look, brass bezel painted black with flat glass, 1 side and 1 bottom inspection doors, top hook for hanging, front of clock secured to case with wooden pegs. Brass pendulum with bob. Time only Fusee chain driven movement. Dial engraved 'James Murray & Co Inventors Melbourne & Royal Exchange London.James Murray & Co Inventors Melbourne & Royal Exchange Londonhorology, clocks, one handed, horology-clocks-james murray & co -
Anglesea and District Historical Society
Pocket Phonograph, Palliard Cie (St Croix), Circa 1926
This mikiphone has an approximate manufacture date of circa 1926. It is stamped in the interior with the maker’s mark of Palliard Cie (St Croix), who partnered with the patent owners, Nicolas and Etienne Vadasz for the large scale production of the mikiphones. A Mikiphone – or Pocket Phonograph is one of the earliest versions of a portable music player. The Mikiphone was small enough to fit into a pocket for portability, and once unpacked had the ability to play 10” records. Power was supplied to the unit by a small hand crank, and sound was amplified by a small resonator. It is estimated that 100,000 to 180,000 of the units were made between 1924 and 1927. Luxury editions were also available with either a gold or silver casing. Le Corbusier is quoted as saying he could ‘see in the Mikiphone the essence of Esprit Nouveau’. The pocket gramophone is significant for historical and social reasons. It is primarily an enabler of leisure activities due to its portability and size. The design of the object is also significant as it showcases design advancements in the early part of the 20th century. The Swiss made "Mikiphone", the smallest talking machine ever placed on the market folded up to the size of a large pocket watch or small cheese case. Production stopped in 1927. A total of 180,000 were made. A few were made in a luxury version with gold or silver case for a "Pretentious clientele".Inside on dial: Mikiphone / Pocket Phonograph / Swiss made / System Vadasz. Outside: Pocket Phonograph / Mikiphone / System Vadosz / Patented in all countries.pocket phonograph, mikiphone, gramophone, pocket, music player, swiss made, switzerland -
National Vietnam Veterans Museum (NVVM)
Equipment - Equipment, Army, AN PRC 64 Radio set
Olive drab metal case. Lunch box size. Contains ear piece on spiral cord and a bakelite morse code key. Lid lists antenna length and frequency channels. Base has switches, dials and battery.radio set an prc, sas -
Melbourne Tram Museum
Ephemera - Bumper Stickers, Radio station 3KZ, "I love Melbourne", c1990
Bumper or car sticker, advertising Melbourne radio station 3KZ, 1179 on the dial featuring Melbourne W2 No. 515. Has been produced in the shape of a heart. On the rear are the "Application Hints". See also Reg item 1489trams, tramways, radio stations, 3kz, advertisements, melbourne, tram 515 -
City of Moorabbin Historical Society (Operating the Box Cottage Museum)
Watches, pocket watch, c1900
A pocket watch is a watch that is made to be carried in a pocket, as opposed to a wristwatch, which is strapped to the wrist.. They were the most common type of watch from their development in the 16th century until wristwatches became popular after World War I The first stem-wind and stem-set pocket watches were sold during the Great Exhibition in London in 1851 and the first owners of these new kinds of watches were Queen Victoria and Prince Albert. Stem-wind, stem-set movements are the most common type of watch-movement found in both vintage and modern pocket watches.In 1857 the American Watch Company in Waltham, Massachusetts introduced the Waltham Model 57, the first to use interchangeable parts which cut the cost of manufacture and repair. Most Model 57 pocket watches were in a coin silver. Watch manufacture was becoming streamlined; the Japy family of Schaffhausen, Switzerland, led the way in this, and soon afterwards the newborn American watch industry developed much new machinery, so that by 1865 the American Watch Company (afterwards known as Waltham) could turn out more than 50,000 reliable watches each year.This silver plated pocket watch with an open glass face has black roman numerals on a white dial , gold hour hands and a blue second hand. The winding stem is at 12 o’clock and has a metal ring for attachment to a chain. Back: of case ; a shield inside 2 circleswatches, brighton, cheltenham, moorabbin, bentleigh, early settlers, pioneers -
Blacksmith's Cottage and Forge
Wireless/ Radio, 1950 (estimated)
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 Ed Muirhead Physics Museum
Post Office Box
Assembled wood, bakelite and metal (screwed). Metal plate top screwed onto wooden box base, 15 black dials 3.0cm in height. Brass electrical connectors, brass plugs with Bakelite tops. Surface finish: machined. Inscribed on top face along the back edge: “T.E.P.L MELBOURNE [an arrow pointing upwards] 240 1941” Inscribed on top face along the front edge: “EUREKA, BRITISH STANDARD OHMS” Also instructive labels inscribed on top face: “POSITIVE POLE/LINE OR EARTH” “LINE AND GALVANOMETER” “GALVANOMETER” “NEGATIVE POLE AT 15.5OCENT” -
Deaf Children Australia
Sonotone 700 Hearing Aid, Sonotone, 1946
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 -
Vision Australia
Photograph - Image, Mt Eliza residents, c.1980-90s
Bill Holt, in wheelchair, and two other residents and staffer Wendy Campbell observe and dial a sundial amongst the garden beds. Crystal Street wears headphones as she listens to a 'Nostaglic Moments' tape. The cassette cover is handed to her by Jenny Johnson.2 b/w photographs of Mt Eliza residents1. Bill Holt, Wendy Campbell. 64% 2. Mrs Crystal Street, Jenny Johnson. 64%association for the blind, george vowell centre (mt eliza), bill holt, wendy campbell, crystal street, jenny johnson