Brass stand on circular brass base with adjustable arm at top holding a brass mounted 6 layered 60 degree prism. The arm can only be adjusted in the angle of the prism, not the height.
Black metal apparatus; two individual scales measuring 'knots' and 'MPH'; scales look like glass thermometers - right hand dial 0-150 and left hand dial 150- 550 mph; converts pressure into speed; serial no 81; ref no 6C/85
Portrait medallion of Thomas Reid, in white on a pale blue background, by James Tassie, 1791. There is an inscription on the shoulder area of the portrait. Proabably made from a soft porcelain paste, mounted in an oval wooden frame, and…
1/2 portrait, wearing high collar and cravat, dark wide-lapelled coat, balding. Background plain. There are 2 portraits of Simpson by James Giles in the collection (see ABDUA 30147).