K/PP107/11/2/4
Dated 1873-1875. From Scientific apparatus, musical instruments and telegraph equipment, [1834-1875].
Nickel silver micrometer made by Elliott Brothers, London, possibly used by Wheatstone.
Dated 1873-1875. From Scientific apparatus, musical instruments and telegraph equipment, [1834-1875].
Nickel silver micrometer made by Elliott Brothers, London, possibly used by Wheatstone.