Encyclopædia Britannica 1771–1860
Topic · 2 of 8 editions · peak 242 chars

DIOPTRA

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7th ed. (1842)DIOPTRAarticle242vol. 8, p. 36
8th ed. (1853–60)DIOPTRAarticle242vol. 8, p. 36reprint · J 1.00