The Ballarat School of Mines was the first School of Mines in Australiasia, and had a model mining laboratory which provided testing for a fee.Quarter leather bound book with an alphabetical listing of names, and certificates and stubbs for Ballarat School of Mines Vacuum and Pressure-gauge Testing Apparatus Certificates.ballarat school of mines, vacuum and pressure-gauge testing apparatus certificate book, certicates, stubbs, vacuum testing, pressure gauge testing, m.b. john, berry united gold mining company, birthday company, britannia united gold mining company, cambrain company, dry diggings gold mining company, dimboola flour mill, first chance gold mining company, great northern extended consols rutherglen, h.v. mckay, lady brassey company, llanberris no. 1, llanberris no 2, mcvitty and company, phoenix foundry, e. rowlands, south woah hawp, tinworth and party, victoria corish united, william's fancy company, woah hawp canton gold mining company, woah hawp no. 2, andrew andreson, bourdons, frederick martell, lonie and dingle, cornish gold mines daylesford, j.d. williams, jane brad, clunes, wendouree asylum, electric hydralic dredging party, east jubilee gold mining company, j.e. cowley, john mann, normanby north company, new imperial gold mining company, ballarat brewing company, yarrowee dredging company, a. mckirdy, daylesford, pearce brothers, canadian, hepburn mineral spring company, \e. balhausen, ronaldson borthers and tippett, ballarat woollen mills, cathacart central gold mining company, j.b. robinson

Used by first Warrnambool Cheese and Butter Factory Company Ltd Field Officer, Bruce McLaren, for on-farm testing in the Allansford area to check the amount of suction in milking machines.Phillips Rurakura Vacuum Recorder in a wooden box with lid, metal hinges and fastening clip, screw adjustment and name plate on outside. Inside has a clockwork-operated recorder with pen device to roll of paper.Internal: Trade mark Empel E.M.P. Engineers Ltd PO Box 5125, Hamilton, NZ Aust. Pat. 209 510. NZ Pat. 112 486. External: Empel Phillips Ruakura Type Vacuum recorder, Makers E.M.R. Engineers Ltd. PO Box 5125, Hamilton NZ