James Cocker's patent decimal gauge (micrometer) from his or
- earliest 1857
- Joseph Whitworth and Company Limited
James Cocker's patent decimal gauge (micrometer) from his original patent of 1857 no. 1680, modified by Messrs. Joseph Whitworth and Co. to gauge 0 to 2 inches reading to thousandths of an inch (Whitworth Works no. 119)
- Industrial Metrology
- Object Number:
- furnishing and equipment
- measuring device - instrument
- British Railways Board Records Office; London Midland & Scottish Railway Co.
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