Dornoch Historylinks Image Library

Watchmaker's mainspring gauge
Watchmaker's mainspring gauge

Circular brass gauge for measuring the thickness of mainspring wire. The disc has straightsided teeth projecting from the rim at gradually increasing distances apart. The sizes are numbered from 10 up to 50. The disc has a hole in the centre and below this is the maker's stamp: METRIC STANDARD MAINSPRING GAUGE GEO. PANTON & SON LIMITED GLASGOW. At the top of the disc is a brass thumbscrew with graduated markings which operates a small caliper mounted on the surface of the disc. The gauge is wired to a display board: the back was not inspected and it has not been marked with its catalogue number.
Picture added on 24 April 2008
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