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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 the adjustable column and shaped tripod base, in a 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.

References: MHS 52037

Andrew Pritchard's Achromatic Engiscope, or Microscope, 1836-8