Ramsden type dynameter micrometer

Made:
1785-1795 in England
patentee:
Jesse Ramsden

Dynameter micrometer, Ramsden type, with mother-of-pearl line scales and eyepiece fitted with sliding cover, unsigned, English, 1785-1790.

Details

Category:
Optics
Object Number:
1918-149
Materials:
brass (copper, zinc alloy), mother-of-pearl and glass
Measurements:
overall: 30 mm 28 mm, .032kg
type:
dynameter
credit:
Court, Thomas Henry