Benjamin Martin, The Universal Microscope, ca. 1775

For the history, construction and phases of Benjamin Martin's Universal Microscope, see the excellent article by Dr. Barry Sobel here

This is the later version of Benjamin Martin's Universal Microscope. It is known from some collections, probably always as part of microscope compendia containing also a solar microscope. A very good example can be seen in the Whipple Museum (inventory number Wh.1795). The all-brass microscopes that Martin produced were usually unsigned, because the signature usually appeared on a telescope or the solar microscope. After Martin's death, this design (or perhaps even instruments from his stock auctioned and bought by other makers) appears under the names of other makers, such as John Bleuler (for example MHS 21409, see also Brian Stevenson's  reference to modified versions of Martin’s “Universal” microscope signed by Bleuler), or by Shuttleworth and others as discussed in the Journal of the Royal Microscopical Society, 1908.

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