It is thought that this item may have been made for use at the Ballarat School of Mines. The use is unknown. At one time it was thought to have something to do with lens-making, but this is no longer thought to be the case.
A photograph of this item has the catalogue number 01002.
A mechanism made of cast brass mounted onto a second hand timber base board. Two horizontal coaxial shafts, each ending with a hemispherical cup, facing each other. The right hand shaft is fitted with a crank handle.
The diameter of the two brass domes is 6 cm. The space between the two brass domes from spindle to spindle is 7 cm. Only one dome turns, the one attached to the handle.
Inscriptions & markings
Brass plate on second handtimber base board "J. Sturrock, Dundee. Patentee. Wholesale Agents Jeffries & Co. Woolwich and London."