Christie & Wilson Azimuth Mirror
A prism-type azimuth mirror for ship navigation, made by Christie & Wilson of Glasgow, to a design by William Thompson (later Lord Kelvin).
Tag: instrument
McAughtry Planimeter
A planimeter made in Glasgow by McAughtry & Son, engraved with the name of the MV British Valour, an oil tanker launched in 1927 by Lithgows in Port Glasgow. A planimeter would be used onboard a ship to calculate engine power – it can measure the area under a curved graph.