Optics: a micrometer, for range-finding [?], with diagrams of its operation. Engraving by Barlow.

    Reference:
    47508i

    Licence: Public Domain Mark

    Credit: Optics: a micrometer, for range-finding [?], with diagrams of its operation. Engraving by Barlow. Wellcome Collection. Source: Wellcome Collection.

    no text alternative