Andrew Pritchard Type Microscope, 1835

 

This early type transitional microscope by Andrew Pritchard (1804-1882) is signed on the tube and foot Andrew Pritchard 263 Strand London, with pinion focusing to the racked column of triangular section, mounted in a trunnion above adjustable column and shaped tripod base, in mahogany case with ocular, mechanical stage, objective, Lieberkühn and live box -- 20in. (51cm.) high. 
An optical set was added, which includes:
1/10 inch objective with original can, signed A. Pritchard, 162 Fleet Street London and dating from the period 1839 - 1859.
'B' 1/4 inch objective with original can, signed A. Pritchard, 263 Strand London and dating from the period 1836 - 1839.
'C' objective; focal length not marked.  With original can, signed A. Pritchard, 263 Strand London and dating from the period 1836 - 1839.
'A' 1/2 inch Leiberkuhn objective with original can, signed A. Pritchard, 263 Strand London and dating from the period 1836 - 1839.
'A' 1 (presumably 1 inch) Leiberkuhn objective with original can, signed A. Pritchard, 263 Strand London and dating from the period 1836 - 1839.
Micrometer Drawing Eyepiece with an internal diamond engraved square grid scale.
Plain and unsigned eyepiece.
A rare early Ross objective.  This is a 1/8th inch with original canister.  The lens thread is non-RMS but is the same thread as the Pritchard lenses.  This Ross lens dates to approximately 1838 and has an early form of lens correction - there is an internal slider to move lens components which can be secured in place by the small thumbscrews.  There is a good description of one in the collections of the Royal Microscopical Society on page 165 of Gerard Turner's catalogue of that collection, and it is also described in the 1901 edition of Carpenter.

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