Robert Wilson's pocket mirror, used when travelling. Inscription: Hand-written label on back in ink: my only looking glass while travelling in Egypt and Palestine 1820, 1821, 1822
Complete with integral lamp, transformer and scale for general purpose use. Sensitivity: 510 mm / microampere; scale from 5 - 0 - 5 in steps of 0.1. In solid wooden box with company logo on the front. Can be used for measuring voltages.