Two black and white photographs of a Scalebuoy Unit ready to be installed on the water supply. It is a long tubular shape with ends bolted onto it. At the top it has two vertical fittings with gate valves on each one. Above the gate valves are 2 T's and another gate valve in the centre. The side of the barrel is cut away to reveal the Scalebuoy Units inside. Teal and white label on the back Reg. V. Brock of Bendigo and the photo number.sciences, instruments - general, scalebuoy, bill ashman collection - correspondence, cutaway scalebuoy, reg v brock of bendigo