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Monocular microscope, c 1870.

Exton, David

Monocular microscope, c 1870.
4 0 c m
actual image size: 25cm x 32cm


The working instrument of R B Tolles of Boston, Masachusetts. It has a nosepiece and fine adjustment, and the stage has a hemispherical condensing lens in addition to a swinging focusing sub-stage. Tolles is famous for his pioneering work on immersion objectives.

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© Science Museum / Science & Society Picture Library

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