The Drawings were to be used for manufacture of all the components of the Pikrose engine.Some of the Pikrose Engine was manufactured by Austin Hopkinson and Co. Ltd. The drawings belonged to the SECV and were created in the 1950s. The engine was used in tunnel construction.These drawings were used in the workshop of the SECV during the construction of the Kiewa Hydro Electric Scheme. The engine was used in the tunnel and powered by compressed air.KVHS has the drawings only. Workshop drawings consisting of about 20 paper sheets. Size 2 Pikrose engines powered by compressed air and a winch used to operate a scraper. Used in tunnels of shaft.pikrose engine drawings, compressed air engine, austin hopkinson co. ltd., workshop drawings