Tender document - MMTB - 5 sheets - some pre-printed and some typed with hand written notes titled "Supply and Delivery of Hard Drawn Cadmium Copper Trolley Wire", for Contract No. 107. Stapled top left hand corner. Document has not been filled in and has several notations written in blue ink.trams, tramways, trolley wire, tenders

Samples of both types of trolley wire used in Melbourne during the 1960s. See item 4084 for a tender document with dimensions. Size - 81.3mm2 or .126 inch squared and 129mm2 or .2 inch sq.Demonstrates the two types of trolley wire used in Melbourne during the 1960sCopper, cadmium copper hard drawn grooved trolley wire - two samples of each type.trams, tramways, mmtb, trolley wire, samples, overhead

This speaking calculator was designed to perform several functions as well as memory, in synthetic voice. With two modes - visual or visual plus voice - it was powered by a nickel cadmium rechargeable battery or by a special adaptor from mains supply voltage. Dark brown rectangular box with numerical and mathematical keyboardTSIassistive devices, audio equipment, office equipment and supplies

Sphalerite or sphaelerite is named from the Greek word for 'treacherous' or 'deceiver' as specimens can vary widely in appearance, making them hard to visually identify. It is a zinc sulfide with the chemical composition (Zn,Fe)S, the most important ore of zinc. Specimens of sphalerite can contain iron as a substitute for up to 25% of the usual zinc present, as well as trace elements of gallium, cadmium, geranium and indium. Small amounts of arsenic and manganese may also be detected. Sphalerite is found in igneous, sedimentary and metamorphic rocks. It forms when carbonate rock encounters acidic, zinc-bearing fluid. It often forms in veins or in fissures of the existing rock, with colours and crystal shapes dependent on the composition of the the combining elements. It forms isometric crystal shapes including cubes, tetrahedrons, octahedrons, dodecahedrons. This specimen was collected in approximately 1852, in Broken Hill, NSW, as an adjunct to the Geological Survey of Victoria. It was donated to the Museum in 1868. Victoria and other regions of Australia were surveyed for sites of potential mineral wealth throughout the 19th Century. The identification of sites containing valuable commodities such as gold, iron ore and gemstones in a locality had the potential to shape the development and history of communities and industries in the area. The discovery of gold in Victoria, for instance, had a significant influence on the development of the area now known as 'the goldfields', including Beechworth; the city of Melbourne and Victoria as a whole.The specimen is significant as an examples of surveying activity undertaken to assess and direct the development of the mineral resource industries in Victoria and Australia, as well as the movement to expand human knowledge of earth sciences such as mineralogy and geology in the nineteenth century.A pipe-shaped specimen of sulfide-mineral zinc ore displaying patches of black, brown, beige and gold colouring. The main item has associated broken pieces. geological specimen, geology, geology collection, burke museum, beechworth, mineralogy, indigo shire, geological survey, sphalerite, sphaelerite, zinc ore, broken hill, nsw, victoria, galena, fluorite, chalcopyrite, lead, cadmium, gallium, germanium, indium, iron

Piece of worn trolley wire (copper, probably cadmium copper) taken from north bound trolley wire between poles 9 and 17 (Loop and St. Aidans Drive) on 4/3/1997 during replacement operations. Is badly worn on one side. OK on the other side - slightly curve with worn side on the outside of the curve. Green (Oxidized) and sides, dark brown on top. Has been cut at either end. Images added 3-12-2016 See p14 of Section 65 of ICS Manual Tramway systems etc. London c1921.ballarat, overhead, fittings, trolley wire