...The inner lens is an achromatic 3 1/4 inches diameter, its focal lengthbeing 30 inches... 
Henry H. Snelling 「The History and Practice of the Art of Photography」
...Fourthly, there is the contrast of colourand neutrality, the chromatic and achromatic, or hue and shade...
George Field 「Field's Chromatography」
...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」
...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」
...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 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」
...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 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」
...But awell-constructed achromatic of two or three inches in aperture will notmerely supply amusement and instruction,—it may be made to do usefulwork...
Richard A. Proctor 「Half-hours with the Telescope」
...A refracting telescope which has been freed from theeffects of chromatic aberration is called achromatic...
Garrett Serviss 「Pleasures of the telescope」
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