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

Made:: 1820-1830 in London

maker:: George Dollond

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

Details

Category:: Astronomy

Object Number:: 1994-496

Materials:: brass, glass and mahogany

Measurements:: overall (cae): 85 x 165 x 100 mm

type:: crystal micrometer, split-lens eyepiece micrometer and dynameter

credit:: Tesseract

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Parts

Dynamameter eyepiece micrometer

Dynamameter eyepiece micrometer, one of three micrometers by George Dollond, London in the same fitted mahogany box, c. 1825.

Materials:: brass (copper, zinc alloy) , glass and complete

Object Number:: 1994-496 Pt1

type:: dynameter and instrument component

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