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ID number:  BIRRC-P0171
Institution:  Research and Cultural Collections
Named collection:  Historic Physics Collection
Title / Object name:  Thickness Gauge for Silver Electroplate
Object type:  Thickness Gauge for Silver Electroplate
Date made:  19th century
Materials:  Large steel screw on painted wooden base with paper scales
Measurements:  Diameter 30 cm, height 29 cm

A rather ornate black painted wooden base of several tiers supports a screw that can clamp down on an object to determine its thickness. The screw is turned by a large handle with a pointer that moves over a set of paper scales. These could probably have once been turned independently. One is calibrated linearly from 0 to 100, and the others differently and non-linearly from 0 to 36. The whole is on a circular base that would have been covered by a glass dome. An associated card from a Miss Griffiths dated 18.4.46 reads ‘This instrument belonged to Mr Edward Gilbert Senior (1810-1881) of Bath Row, Birmingham and was used in the early days of silver electroplating.’

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