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Boxwood Button Gauge by SMALLWOOD - Caliper Rule
A scarce and little used SMALLWOOD button gauge caliper rule.The measuring of buttons was standardised in the late 18th century by a Mr Matthew Boulton of Birmingham. This new standard measured button in lines with 40 lines to the inch.Boxwood with brass fittings.Marked 'I&D SMALLWOOD MAKERS B'HAM. ENGLAND' on one edge.The boxwood body is graduated into eighths and sixteenths.The brass caliper slide is graduated into 40ths/inch or 40 lines per inch.Matching '888' stamps on the back of the caliper slide and within the recess.11/8 inches wide, 31/2 inches overall length.A very nice example.