F2109

Dipleidoscope Long Caption: Dipleidoscope dial for latitude 52˚ north. It has a square base set on three small feet, one of which is also a levelling screw. A steel compass needle is set in a glazed rectangular box along one edge. The needle can be locked in position by an arm operated by a lever on the side of the box. This box has a degree scale at one end and a bubble level on the base. An inclined brass pillar supports the body of the dial. This consists of a squat cylinder, in the upper face of which is a glass aperture behind which are set two mirrors. Below the cylinder is a silvered hour arc. Both of these parts are attached to a pillar which can rotate within the main pillar, but which can also be locked in position. Credit line: © National Maritime Museum, Greenwich, London Object: AST0183 Artist: Edward John Dent & Co. Date: 1840-1860 Medium: oxidised brass; silver; steel; brass; glass Size: 95 mm x 107 mm Click here to buy a bespoke print of this image.