...Galileo must be regarded as the inventor of this kind oftelescope, which in one respect differed very materially from the oneconstructed by the Dutch optician...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...But the price which the optician demandedseemed more than Herschel thought he could or ought to give...
Robert Stawell Ball 「The Story of the Heavens」
...The tool of the optician is a very simple affair,being nothing more than a plate of iron somewhat larger, perhaps afourth, than the lens to be ground to the corresponding curvature...
Simon Newcomb 「Side-lights on Astronomy and Kindred Fields of Popular Science」
...It may be remarked that this lastadjustment is the proper work of the optician, since it is so difficultthat the user of the telescope cannot ordinarily effect it...
Simon Newcomb 「Side-lights on Astronomy and Kindred Fields of Popular Science」
...The test applied by the optician is much more exact, and also moreeasy...
Simon Newcomb 「Side-lights on Astronomy and Kindred Fields of Popular Science」
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