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Achromatic objective with Ross thread

1840-1870
Object glass lens number 5, for compound microscope, by John Marshall, London, England, 1715

Objective glass lens No. 5, from Marshall's 1715 compound microscope

1715
Object glass lens number 4, for compound microscope, by John Marshall, London, England, 1715

Objective glass lens No. 4, from Marshall's 1715 compound microscope

1715
Object glass lens number 3, for compound microscope, by John Marshall, London, England, 1715

Objective glass lens No. 3, from Marshall's 1715 compound microscope

1715
Object glass lens number 2, for compound microscope, by John Marshall, London, England, 1715

Objective glass lens No. 2, from Marshall's 1715 compound microscope

1715