Troy ounces are slightly heavier than avoirdupois ounces that we commonly use. 1 troy ounce equals roughly 1 1/8 ounces and is used for the weighing of precious metals and gems. It is believed that the troy ounce dates back to the 16th century to the town of Troyes in Frances. This was a major trading centre for Europe and a standardised for of weights was needed. One troy ounce equalled 480 grains of barley.Two Sets of Troy weights all circular and tapering to the bottom plus two individual weights - 1oz. One Complete set of Troy weights round in shape and tapering to bottom with six inner weights imprinted with 6oz, 4oz, 2oz, 1oz and nothing on two inner smaller ones.2nd set is incomplete with three inner crucibles next size is missing and then smallest size 6oz 4oz 2oz 1oz . Two individual weights 1oz.gold mining, gold mining crucibles, gold mining equipment, gold smelting

October inwards correspondence for the Ballarat School of Mines. * School of Mines and Industries, Bendigo (certification of Mine Managers) * Telegram - examination papers * Commonwealth telegram - Ballarat School of Mines battery availability for crushing ten tons. * Letterhead from the Roneo Co., Melbourne * J. Donald of Wallace St, Toorak * Letterhead from York Chambers, 49 Queen Street, Melbourne - signed J. Kaufmann * Letterhead from Cochran & Co - re Cocnran boilers * Letterhead of Thames School of Mines, New Zealand * Letter re James Chambers missing school from his father James Chambers Snr of Talbot * Education Department Circular * letter signed by F.W. Calaby * F.W. Silberberg & Co re crucibles * Letterhead of New Black Horse Mining Company - signed E. Howell * Australasian Institute of Mining Engineers, 57-59 Swanston Street, Melbourne - signed D.L. Stirling * Letterhead of John F. Paterson * Letterhead of the Welcome Stranger Dredging Company, Dunolly - W.J. Parker manager * Letterhead of Nevett and Nevett Barristers and Solicitors, Lydiard Street, Ballaarat * John Barker, H. Barbour * Telegram re Brearley Lyndhurst * Letterhead of the Commonwealth Minerals Co - John F. Paterson, Legal Manager * Query re courses at the Ballarat School of Mines - A. O'Mara * Stone to be crushed, Egerton from J.H. Davidson * Letterhead from 'Terascoa' Port Kembla signed by W.S. Macartney * Letter from Thomas Williams * Letterhead from Australian Institute of Mining Engineers regarding excursion to Toongabbie and Walhalla - Signed D.L. Stirling * Assay from George Brearley of Lyndhurst via Scottsdale * Letterhead of Berry United Deep Leads Limited, Ulina * Embossed leather classes for coachwork from S. Mee of Clunes * The Lord Nelson North Gold Mning Company No Liability signed by Edward H. Shackell * Correspondence from May Consolidated Gold Mining Company, Transvaal signed by Jason Hawthorne * Letterhead of the Northern Assurance Company, 448 Collins St, Melbourne * Letter fom James Lidgett of "Braelands" Myrniong * Gordon sides asking for a reference * Letterhead of Fraser & Chalmers Ltd, Manufacturersw of mining machinery, steam engines, boilers and machinery for systematic milling, smelting and concentration of ores, signed by W.R. Caithness * Letterhead of the Board of Examiners for Engine-Drivers, signed by R. Birrell * Letter concerning outstanding amount due to theBallarat East School of Design, signed by Edward Reid, Manager * Letterhead of the Ballarat Public Library concerning an outstanding amount in the School of Design Account. * Letterhead of the A. Gallenkamp and Co. regarding their new catalogue * Letterhead from the Creswick Advertiser, Albert Street, Creswick * Handwritten letter from John Brittain inviting Ballarat School of Mines students to join him at the telescope weather permitting * Letterhead of Victorian Railways, signed by E.B. Jones * Letterhead of the Ballarat East Town Clerk's Office * Letterhead of Elliott, Maclean and Co. Handwritten letter re Dressmaking from J.H. Wrightrand, south africa, kalgoorlie, school of mines and industries, bendigo, certification of mine managers, bendigo school of mines, telegram, ballarat school of mines battery, roneo co., melbourne, j. donald, york chambers, cochran & co, thames school of mines, new zealand, james chamberseducation department circular, f.w. calaby, * f.w. silberberg & co, crucibles, new black horse mining company, e. howell, * australasian institute of mining engineers, john f. paterson, welcome stranger dredging company, dunolly, w.j. parker, nevett and nevett, john barker, h. barbour, brearley lyndhurst, commonwealth minerals co, a. o'mara, j.h. davidson, 'terascoa' port kembla, w.s. macartney, thomas williams, australasian institute of mining engineers, excursion, toongabbie, walhalla, d.l. stirling, george brearley, lyndhurst via scottsdale, berry united deep leads limited, ulina, embossed leather classes for coachwork, s. mee, clunes, the lord nelson north gold mning company no liability, edward h. shackell, may consolidated gold mining company, transvaal, jason hawthorne, northern assurance company, james lidgett, "braelands" myrniong, gordon sides, fraser & chalmers ltd, mining machinery, w.r. caithness, examiners, ballarat east school of design, edward reid, ballarat public library, school of design, a. gallenkamp and co., creswick advertiser, john brittain, telescope, victorian railways, e.b. jones, ballarat east town clerk's office, elliott, maclean and co., dressmaking, j.h. wright, ausimm, berry united, school of mines and industries bendigo, lyndhurst tasmania, may consolidated gold co germiston transvaal, transvaal, germiston, roneo, thames school of mines, schools of mines, welcome stranger dredging co, cowley copper development syndicate ltd, department of mines, maryborough school, pharmacy board of victoria, tongalla survey camp, ballarat fine art gallery association, central microscopical

Clay crucible marked Battersea Round F Morgan England commonly used for melting gold.Morgan Englandmining, equipment, crucible

Clay crucible marked Battersea Round F Morgan England commonly used for melting gold.Morgan Englandmining, equipment, crucible

Clay crucible marked Battersea Round D Morgan England commonly used for melting gold.Morgan Englandmining, equipment, crucible

Clay crucible marked Battersea Round G Morgan England commonly used for melting gold.Morgan Englandmining, equipment, crucible

Clay crucible marked Battersea Round G Morgan England commonly used for melting gold.Morgan Englandmining, equipment, crucible

Clay crucible marked Battersea Round commonly used for melting gold.mining, equipment, crucible

Clay crucible marked Battersea Round E Morgan England commonly used for melting gold.Morgan Englandmining, equipment, crucible

Pottery gold crucible. Printed on outside of crucible ' G Bendigo'G Bendigobendigo, gold mining, gold crucible

Pottery gold crucible. Printed on outside of crucible ' H Bendigo'. Inside of crucible is stained black.H Bendigobendigo, gold mining, gold crucible

Pottery gold crucible. Printed on outside of crucible ' Batttersea Round, E, Morgan England'bendigo, gold mining, gold crucible

Bendigo clay crucible used for smelting, assaying and refining gold. Printed inside circular mark on side of crucible in black : 'Bendigo Clay Crucible' Large letter 'G' stamped in centre. Manufactured by Bendigo Pottery.gold mines, mining equipment, gold crucible

Bendigo clay crucible used for smelting, assaying and refining gold. Printed inside circular mark on side of crucible in black : 'Bendigo Clay Crucible' Large letter 'F' stamped in centre. denoting size. Manufactured by Bendigo Pottery.gold mines, mining equipment, gold crucible

Small, clay crucible bowls, used for smelting, assaying and refining gold. Pink discolouration inside crucible. Impressed on bottom of crucible "Battersea Works England' and number '3', denoting size, in centre of maker's name.Battersea Works Englandgold mines, mining equipment, gold crucible

Small clay crucible bowl used for smelting, assaying and refining gold. Maker's name impressed on bottom 'Battersea Works England ' and '2 ?1m', possibly denoting size of crucible.Battersea Works Englandgold mines, mining equipment, gold crucible

Small clay crucible used for smelting, assaying and refining gold. Maker's mark indecipherable on bottom of crucible.gold mines, mining equipment, gold crucible

Small gold crucible, bowl shape, used for smelting, assaying and refining gold. No maker's mark on base.gold mines, mining equipment, gold crucible

Clay gold crucible used for smelting, assaying and refining gold. Inside of crucible discoloured with brown and pale green mark. Maker's name on side: 'Juleff, number 78, (location indecipherable) England.Juleffgold mines, mining equipment, gold crucible

Earthenware Crucible (Small) probably for gold smelting. Found on Banks Mining Dam Deep Leadstawell

Assay is a process of metallurgy and chemical analysis used to determine proportions of precious metals in ores and other metallurgy substances such as silver or gold. The process helps identify pollutants present within a sample and can indicate a high level of pollution in a mining site. Stoneware crucibles are used in the fire assay process due to their ability to withstand high temperatures. Fire assay is a three step process where by samples from the mine are ground in a find powder and then mixed with dry powder chemicals. This mixture is heated in a crucible to extreme temperatures (crucible fusion) until all of the powers fuse into a glass like slag. Once this reaction is complete, the contents are poured into a mold and cooled. In step three (known as cupellation) the mixture is separated in a fire assay cupel and once this is complete the cupel with reveal a small bead of precious metals. Established by George Guthrie in 1857 (about 5km north of its current site) and then again seven years later in 1864 after it initially closed, Bendigo Pottery remains one of the most influential and longest running potteries in Australia. Over the years the Pottery has contributed to the growth and development of the district through both its products including building products, table ware and decorative and commemorative war as well as artistically, being responsible for training and supporting many potters locally. It has partnered with the City on various tourism promotions and the Civic Collection holds a number of important items within its collection.Two stoneware vessels of differing dimensions (0287.1 & .2). Unglazed and porous, showing extensive signs of use. Stamped and marked on the outside. 0287.2 has a shaped pouring lip. Six smaller items, coins, buttons (0287.3,.4,.5,.6,.7,.8) were found with the crucibles but their relationship to the assay items is unknown.0287.1; Large crucible; Bendigo Pottery / E. 0287.2; Small crucible: Pottery / C Icity of greater bendigo commerce, city of greater bendigo mining, making a nation exhibition

The Ballarat School of Mines was the first School of Mines in Australia and was established in 1870. 22 page booklet titles 'The Ballarat School of Mines: A Statement of the Objects and Resources of the School.' The book has a number of illustrations including the interior of the Ballarat School of Mines Laboratory, and the former Ballarat Circuit Court House. It includes a statement of the formation, progress, and present position of the School of Mines, Ballaarat. The image of the Ballarat School Mines Assay Room shows assay furnaces, crucibles, chimney, and teacher Joseph Flude on the far right. This room is now is a building known as the 'Old Chemistry Building'. Plan and elevation of the new Metallurgical Laboratory and Proposed Chemical Laboratory is depicted.On front cover "Recorded in M-A" "1873"ballarat school of mines, assay, courthouse, joseph flude, crucible, furnace, flude, warrington rogers, brough smyth, harrie wood, wood, james bickett, bickett, redmond barry, somerville learmonth, metallurgy, chemistry, laboratory, examinations, mining engineer, assayer, inorganic chemistry, underground managers, captains of shift, engieners, enginedrivers, louis balhausen, james campbell, l.s. christie, j.j. casey, alexander dempster, g. higinbotham, james martin, alexander millan, malcolm morrison, band of hope and albion, city of ballarat mining company, city of canterbury gold mining company, egerton mining company, el dorado gold mining company, golden reef gold mining company, happy valley company, hope quartz mining company, long tunnel gold mining company walhalla, hopewell quartz mining company, imperial quartz mining company, student numbers, fees, magdala quartz mining company stawell, mariners and sloane's quartz mining company, new north clunes company, park company, temperence quartz company, tookey quartz company new zealand, walhalla gold mining company, matthew seal, harrie woodmuseum, duke of cornwall claim, john lynch, robert m. sergeant, engineers, f.w. niven, william henry barnard, ballarat school of mines museum, museum, ballarat school of mines library, donations of specimens, mining