Physical description

Scalebuoy. Invented by Hartley Abbott and patented under the name of the Bendigo Electronic Company, made in various sizes & for different applications, such as to prevent scaling in the boilers at mines. Made up of a sealed glass bulb containing mercury and gasses enclosed within a chromed wire cage and with a chromed handle. The one shown being a handheld shaker model. Part of the Aileen and John Ellison collection.