Piece of paper with a sketch of a Scalebuoy Unit used in conjunction with water treatment & Plant attached to a wood fired Boiler at the Pyramid Hill Butter Factory. Sketch shows the Scalebuoy Unit. Note at the bottom mentions that he did not see the unit as it was intended for use. The unit had been broken up when he first saw it. Would have been about thirty mercury flasks, each of which was covered in an easily removable film of salt deposit. Interest was sparked after cleaning one of the flasks and seeing the engraving. He regretted not taking the whole of the unit. On the back is written the name - Frank Honeychurch-8 Harley St, Bendigo 1/3/02.sciences, instruments - general, scalebuoy, bill ashman collection - correspondence, pyramid hill scale buoy butter factory, frank honeychurch