James Cocker's patent decimal gauge (micrometer), and wooden box, unmarked, United Kingdom, 1857
Patented by James Cocker in 1857, this decimal gauge micrometer did not rely on a micrometer screw. It was modified by Messrs. Joseph Whitworth and Co., to measure from zero to two inches with a scale graduated in thousandths of an inch.
- Industrial Metrology
- Object Number:
- furnishing and equipment
- measuring device - instrument
- British Railways Board Records Office; London Midland & Scottish Railway Co.
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