Opera glass, monocular / case

Monocular opera glass with oxidised brass tube enamelled in red and yellow stripes, in a red leather case, made by Ramsden of London, late 18th century

Metre scale

Metre scale, by Adie & Son, c.1840, for the Northern Lighthouse Board

Microscope

Compound Wenham binocular bar-limb microscope in brass, bronze and oxidised brass, on an inclining pillar and flat 2-toed tripod base, by George Lowdon (Lowden) of Dundee, c. 1870

Pitchometer

Chapman-Hunter pitchometer, in brass and oxidised brass with silvered scale and velvet-lined fitted case, signed by Dobbie McInnes Ltd of Glasgow and London, c. 1910