This microscope was produced by the Parisian optician Louis Joseph Deleuil (1795-1862), according to specifications suggested by François-Vincent Raspail (1794–1878), as a modified version of the Cuff/Ellis type aquatic microscope. In the literature, it is said to have tourmaline lenses for high magnifications (to reduce aberrations as tourmaline has an extremely high refractive index). Still, my examination of at least the high magnification in this instrument proved it untrue.
This successful design of a portable single microscope was planned by François-Vincent Raspail
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