...He will find thathe has not given exactly the proper curves to secure achromatism... 
Simon Newcomb 「Side-lights on Astronomy and Kindred Fields of Popular Science」
...The perfect achromatism of a reflectoris, of course, a great advantage, but the chromatic aberrationof refractors is now so well corrected that theirinferiority in that respect may be disregarded...
Garrett Serviss 「Pleasures of the telescope」
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