Viewer microscope, with bead lens, in square body

Made:
1888-185
Viewer, bead lens held in lid of tin by a collar

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Viewer, bead lens held in lid of tin by a collar
Science Museum Group
© The Board of Trustees of the Science Museum

Viewer, bead lens held in lid of tin by a collar, the tin being square section, with a central aperture and square hole in base cap, American patented 1888