...Thus arranged, hewas placed under a power of two hundred and fortylinear, and illuminated by an achromatic condenser, tomake the fine structure of his gizzard as plain as possible... 
Henry J. Slack 「Marvels of Pond-life」
...Fourthly, there is the contrast of colourand neutrality, the chromatic and achromatic, or hue and shade...
George Field 「Field's Chromatography」
...And more recently Sir David Brewster stated that Wargentin'had in his possession a good achromatic telescope, which always showedVenus with such a satellite...
Richard A. Proctor 「Myths and Marvels of Astronomy」
...In a refracting telescope we have to employ whatis known as the achromatic combination, consisting of one lens of flintglass and one of crown glass, adjusted to suit each other with extremecare...
Robert Stawell Ball 「The Story of the Heavens」
...In the year 1825 the largest achromatic refractor in existence was oneof nine and a half inches in diameter constructed by Fraunhofer for theObservatory of Dorpat in Russia...
Cecil G. Dolmage 「Astronomy of To-day」
...The negative eye-piece, being achromatic, is commonly employed in allobservations requiring distinct vision only...
Richard A. Proctor 「Half-hours with the Telescope」
...[Footnote: The following is a rough rule for getting an idea of theprice of an achromatic objective, made to order, of the finest quality...
Simon Newcomb 「Side-lights on Astronomy and Kindred Fields of Popular Science」
...In this kind of eyepiece theimage is formed between the two lenses, and if the workis properly done such an eyepiece is achromatic...
Garrett Serviss 「Pleasures of the telescope」
...The first actual inventor andconstructor of an achromatic telescope was Chester Moor Hall, who was not intrade, and did not patent it...
George Forbes 「History of Astronomy」
...Frauenhofer, at the beginning of the nineteenth century, while applyingDollond’s discovery to make large achromatic telescopes, studied thedispersion of light by a prism...
George Forbes 「History of Astronomy」
...Each kind of instrument has, indeed, its specialadvantages; though perhaps, on the whole, the most perfect type oftelescope is the achromatic refractor...
Cecil G. Dolmage 「Astronomy of To-day」
...The achromatic object-glass, invented by Dollond, about 1750, obviatesthis difficulty, and brings all the rays to nearly the same focus...
Simon Newcomb 「Side-lights on Astronomy and Kindred Fields of Popular Science」
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