Historical information

The seven weights (0008.4 and 0136.3) are circular in shape with a hole in the centre and a groove cut across the radius. They were specifically designed to fit into a weight tube, which allowed movement of the weights that were used for driving the clockwork mechanism for turning the lighthouse lens. They are most likely original to the Chance Brothers system installed in 1913, which was originally equipped with a set of ten, each weighing around thirty kilograms.The weights were moved vertically in similar fashion to the way weights move on a grandfather clock. As the weight fell, the optic clock was driven and the lens was turned. To keep the clock turning, the weight needed to be wound back up to the top of its travel. Lighthouse keepers had to constantly wind the clock to keep the light active, and at least two keepers needed to observe a strict roster of hours. When electric motors were invented, weights became obsolete and the motors were able to turn the optic for as long as there was power to drive them. Wilsons Promontory’s Chance Bros. kerosene operated light, which was turned by a clockwork mechanism, was replaced by small electric motor in 1975, reducing the number of keepers and eliminating the need for weights. Cape Schanck has a set of fourteen weights remaining in situ in the lighthouse weight tube as well as
another four detached weights, two of which may be associated with the 1859 mechanism. A small number of detached cast iron weights and two associated rods remain at the Point Hicks Lightstation and one weight is displayed in the lantern room at Cape Otway.

Significance

The Wilson Promontory weights have first level contributory significance for the insights they provide into the technology and operations of a late nineteenth/early twentieth century lighthouse which has since been superseded. They are well provenanced and are significant for their historical value as part of the lightstation’s Chance Brothers optical system installed in 1913.

Physical description

Four circular disc shaped lead weights, all with a narrow section cut out to the middle of shape. (as in slice of cake)