Physical description

Black and white photograph. One male with right hand on wheel of control valve in the compressed air pipe outlet of a two stage or compound air compressor with con rod and crank shaft to a large flywheel. Two belts to a vertical governor. Outgoing air pipe vertical to ceiling of enclosing building. Inscriptions: Nameplate or bed plate 'A Roberts and sons, Engineers, Bendigo' Lower left corner handwritten 'with A Rob. Compliments' On back - 'Compound Air Compressor'.