Experimental micrometer using Ayrton-Perry magnifying spring to read to 1/20

Made:
earliest 1909

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Experimental micrometer using Ayrton-Perry magnifying spring to read to 1/20,000 of an inch; patented in1909.

Details

Category:
Industrial Metrology
Object Number:
1909-81
type:
micrometer
taxonomy:
  • furnishing and equipment
  • measuring device - instrument
credit:
Ayrton, A.