Gold bearing ore is pulverized by cast iron stampers (steam driven) and material then passes over a large copper plate covered in mercury causing the gold particles to combine with the mercury to form an amalgam which is scraped of and placed in a retort. The retort is heated causing the mercury to evaporate leaving the gold to be refined into ingots. The mercury is cooled as it leaves the retort and is reused. A second tray covered in what is called a blanket traps any fine gold that has passed the first plate. Finally the residue material goes over a vibrating table called a Wilfley Table which captures any iron pyrites which may contain about three percent gold. this is roasted and treated to recover any remaining gold at a special treatment plant.Wooden model of a five heads gold stamper battery. The gold stamper battery is a device for crushing ore. The parts of the battery are cams; dies; guides; kingposts; mortar box; shoes; stamps (or stampers); tappets. gold mining, mining equipment, gold stamper

This slide projector, which was purchased new in 1949, could be used on mains power or a car battery. It was used by Deaconess Hilda Fisher (Graham) as she travelled to promote the work of the Methodist Home Mission in Victoria and the inland of Australia.Tri-purpose SVE projector in its carry box. Picturol Model DD.115 volts, 150 Watts. Serial No. 12710. Includes two two inch semi-automatic slide changers, one in its original box; four six volt globes and electrical leads for connection to a car battery. Five pieces in all.methodist inland mission, deaconess hilda fisher, methodist deaconess, women's home mission league, methodist home mission

Used by Manning Pharmacy, Flinders Street Railway Station, Melbourne, until 1984.Black metal battery case with a globe at one end in the shape of tongue depressor, top and base unscrew from battery holder.Label on base 'Manning . Chemist . Melbourne.

Artillery Battery Photo probably Britishphoto, army

8/12 Battery RAA headquartersplaque, varios, army

Colour photograph of a battery operated calculator.calculator, mathematics

Cast iron mercury bucket, used to hold mercury, potentially in the process of recovering minute pieces of gold mixed in soil and sediments. See research page for description of one process of using mercury to extract gold.gold mines, mining equipment, mercury bucket, miners used mercury in a number of ways to amalgamate gold, with each mill or battery operator having their preferred method depending on the nature of the ore. by the late 1850s the most common way of crushing goldbearing quartz ores or consolidated alluvial cements was in a stamp battery. the battery featured heavy iron stamp heads held in a frame, with each head often weighing up to 500 pounds (226 kg) or more (see msv 1880, page 45) (birrell 2005). stamp heads were lifted and dropped by a rotating overhead cam shaft driven by a steam engine or water wheel. ore was fed into a large cast-iron battery box, mixed with a steady stream of water, and pulverised by the stamp heads. in some batteries, mercury was placed in the base of the boxes to amalgamate with freed gold. the violent agitation of the mercury in the mortar box, however, could cause the mercury to break into myriad tiny globules that were carried away by the water with the tailings, thus losing a certain amount of gold in the process (thompson 1867; ritchie & hooker 1997). the water and sand slurry was splashed by the falling stamps from the box through fine mesh screens and onto inclined wooden tables below the mortar box (figure 2). the tables were covered with copper sheets or plates coated with mercury, which caught and amalgamated with a portion of the gold. the grey putty-like amalgam was periodically scraped off the sheets and retorted in a furnace to collect the gold and recover the mercury for reuse. mercury was inevitably lost from the plates, while poor maintenance resulted in further losses of gold and mercury in the tailings. mercury use and loss from gold mining in 19th century victoria. peter davies1, susan lawrence, and jodi turnbull, department of archaeology and history, la trobe university.

Black framed colour photo of Bayne (Gus) Kelly receiving US Commondation Medal - September 2011Only 40 years latea field battery, bayne (gus) kelly, greg laird. col (retd), tony williams, col (retd), ivan cahill, lt col (retd), graham kells, ua army commendation medal

Black framed colour photo of three Gunners firing a curfew round of artillery at Kiwi lines Nui Dat - June, 1971 "A" Fd BtyFiring the Curfew. A Fd Bty at Kiwi lines Nui Dat June 1971a field battery, gnr lawrie crestani, gnr david gibson, bdr paul kennedy

After the 1939 bushfires, the Forests Commission Victoria invested heavily in a radically new communications network. After suffering some inevitable delays due to the war, radio VL3AA switched into full operation in October 1945 proudly beaming out 200 watts across the State. But by today’s standards, the technology was primitive and the reception poor unless the user was on a high point somewhere. The radio signal was "line-of-sight" and bounced between fire towers and relay transmitters across the mountains back to the District offices. The advent of solid-state electronics in the 1960s replaced the more delicate valve sets which enabled greater use of vehicle mounted radios. The Commission continued to research, develop and build new radios at its many workshops around Victoria. The network was supported by a large team of skilled radio technicians. The more secure and versatile State Mobile Radio (SMR) digital trunk system came into operation in about 1995. Upgraded Tait Radios were purchased in 2014 after recommendations of the 2009 Bushfires Royal Commission. But it was the convergence of separate technologies such as 5G mobile phones, high-capacity and light-weight lithium batteries, Wi-Fi, the ever-expanding internet, cloud data storage, digital cameras, GPS, personal organisers and hundreds of supporting Apps into powerful smartphones and tablets which revolutionised bushfire communications from the mid-2000s. Portable radio with handset Includes battery pack in vinyl carry case and carry strap With socket to attach external aerialModel Ebushfire, radios, forests commission victoria (fcv)

Motorola Portable radio Saber UHF mullti Channel Small antenna Metro portable radio PR 196Motorola battery premier Ni cad Australia

Item issued to Malcolm Stuart Angus No 3112710, served Vietnam.Drab olive coloured Battery operated Torch.“Made in England 6230-99-910-5033”military-equipment, torch

Used in the field on South Australian Projects by Terry Peacock and others.Bought in 1990 this was the first type of mobile phone used in the field by ATCV. Mobile Telephone handset, battery in carry case. Manufacturer was Motorola. Distributor Telecom Australia (later Telstra). Also CVA asset no. on leather carry case.australia, telephone, mobile, telecom, motorola, south, 1990

Photo Heavy Morter Battery probably Britishphoto, army

Head Light - battery operated on plastic bandhead, light, battery

COPY OF LITHGRAPH OF PORT PHILLIP BATTERY 1869local history, photography, photographs, mining

A battery operated emergency life buoy light4.88emergency light, safety at sea

Stamper Dolly” (Octagonal) from Government Batterystawell

Used to warn traffic of hazardsBattery operated traffic warning light - greenforests commission victoria (fcv), safety equipment

The first commercial digital hearing aid was created in 1987 by the Nicolet Corporation. The hearing aid contained a body-worn processor that had a hardwire connection with an ear mounted transducer. While the Nicolet Corporation’s hearing aid was not publicly successful and the company shortly folded, it was able to start a competition between companies to create more effective hearing aids. Two years later, in 1989, the behind-the-ear (BTE) digital hearing aid was launched. In addition to the Nicolet Corporation, Bell Laboratories expanded upon the hearing aid business by developing a hybrid digital-analog hearing aid. When the hearing aid was put on in the market, it was instantaneously successful. This development helped bring major changes to the world of the hearing aid. The next major milestone was creating an all-digital hearing aid. The Oticon Company developed the first digital hearing aid in 1995, but it was only distributed to audiological research centers for research on digital technology in the realm of acoustic amplification. The Senso was the first commercially successful, all-digital hearing aid, and was created by Widex in 1996. After the success of the Senso, Oticon began marketing their own hearing aid, the DigiFocus. Presently, the digital hearing aid is now become programmable. By making the hearing aid programmable, it has allowed hearing aids to be capable of regulating sound on their own, without using a separate control. The hearing aid can now adjust itself depending on what environment it is in and often does not even need a physical volume control button. Silver metal case with side clips and hearing aid attached. Has battery compartment for AA batteries. Volume control is the top left hand corner. "C OF A/CALAID/36778" on back of case deaf children australia, hearing aid, calaid

Photograph of Warrnambool Battery M Jones and George Greening flagstaff hill, warrnambool, shipwrecked-coast, flagstaff-hill, flagstaff-hill-maritime-museum, maritime-museum, shipwreck-coast, flagstaff-hill-maritime-village