Probably used at the Ballarat School of Mines for the Mine Driving CertificatePrinted book (missing cover) on Mine Haulage and Haulage Systemsmining, ballarat school of mines, haulage, gravity planes, engine planes, tail-rope system, knock-off links

1945 Slide Rule US Army Air Force from Prof. Allan Bromley.Works by adding Angular moments together to find centre of gravity (COG) of a plane (adds bombs, ammunition and crew on board).Brown Leather Case with 'Slide Rule' inner.Load Adjuster, Property of US Government. 102630 on case. 81629. Airplane serial No. 44-4-1195, Model B-24Jbomb load adjuster, a16

See 16mm film footage of vintage aircraft VH UIU and VH UMA, Both aircraft are bi-planes with folding wings. The engines are mounted upright. The gravity supply petrol tanks are fixed amidships to the top wing. The straight wings, shape of the rudders, the wheels and configuration of the undercarriages all suggest to me that both aircraft are DH60 CIRRUS MOTHS that would have been built from 1925 to 1929. The exhaust pipes, which are mounted on the left side, (later to be moved by de Havilland to the right side) may suggest that the two aircraft in the film may be closer to 1925. VH UIU may be found from 0 to 58ft and VH UMA from 185ft to 26ift. for Description