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Optical instrument for measurement of astronomical photograph plates

Optical instrument, for measurement of astronomical photograph plates, metal / glass used at Sydney Observatory, made by H Yeates, Melbourne, Victoria, Australia, 1940-1949. Plate measuring machine used to measure astrographic plates. The machine consists of a steel frame with a three legged base that supports a two armed bracket. The lower arm supports a plate frame which has two scales at right angles to one another, marked in centimetres. A hole in the plate frame allows light to be reflected from a concave mirror below the frame through a section of the plate and up into the microscope. The upper arm of the bracket supports a microscope with micrometer on a rotating circle, which is marked from 0-360 degrees. A rotating vernier scale is at one end of the microscope support. A black painted eye shield rotates around the microscope support. Final measurements are taken through the micrometer that can be rotated in any direction.

View object on the British Library on Flickr Commons site (opens in new window).

(Accession num: H10183)

So far people have added content in 2 turns about this object.

Tags

microscope, optical, instrument, scientific, measure, astronomical, photograph plates, metal, iron, glass, portable, ray, silver colour, triangular base, rectangular plate

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