Double-image crystal ocular micrometer, for Smythian telescope

Made:
1826
maker:
Thomas Charles Robinson

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Double-image crystal ocular micrometer by Thomas Robinson, Portland Place, London, in mahogany case, 1826. Used with the Smythian telescope a refractor of 3 3/4 inch aperture and 50 inch focal length with optics by Charles Tulley.

Details

Category:
Astronomy
Object Number:
1988-197 Pt4
Materials:
brass, complete, glass, mahogany and silver
Measurements:
overall (estimate): 90 x 130 x 100 mm
type:
instrument component
taxonomy:
  • component - object
  • furnishing and equipment
  • measuring device - instrument
  • micrometer - angle
  • double image micrometer