...We found one make that was superior to any other of the same price andequal optically, and nearly as well made as those costing three times as much... 
Chester A. Reed 「The Bird Book」
...Andthough optically it was not apparent, the elliptical curve of it wasrounding the Moon, disclosing the hidden starfield to ourinstruments...
Raymond King Cummings 「Wandl the Invader」
...It must always be remembered that a certainproportion of stars (amongst those separated by so considerable adistance) must be optically combined only...
Richard A. Proctor 「Half-hours with the Telescope」
...So far as we have yet described our telescope it is optically complete...
Simon Newcomb 「Side-lights on Astronomy and Kindred Fields of Popular Science」
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