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Brass dynameter

1790-1890

Ramsden's mother-of-pearl dynameter, as made by Troughton & Simms, about 1850

Ramsden's mother-of-pearl dynameter

1850

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

Ramsden type dynameter micrometer

1785-1795

Brass dynameter with dial in velvet-lined burgandy leather box with handwriten note, Troughton & Simms, London, 1790-1890

Brass dynameter with dial in velvet-lined burgundy leather box

1790-1890

Split-lens eyepiece position micrometer with spherical crystal micrometer and eyepiece dynameter, all by George Dollond, London in fitted mahogany box, 1820-1830.

Split-lens eyepiece position micrometer with spherical crystal micrometer and eyepiece dynameter

1820-1830