Dial micrometer, 1760-72. This is one of tw
4 0 c m
 
33cm
actual image size: 25cm x 32cm

Dial micrometer, 1760-72. This is one of tw

© Science Museum / Science & Society Picture Library

Description

Dial micrometer, 1760-72. This is one of two micrometers made by Joseph Finney of Liverpool between those years. The micrometer acts as a form of pyrometer, measuring the elongation of a bras bar when heated and comparing it with the elongation of another material similarly heated.
 

Image Ref.

10190801
 

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