Childe used achromatic lenses and an improved oil-lamp; and moved to the limelight, then associated with Thomas Drummond.
12.
After successfully defending a legal challenge to the patent he held for the achromatic lens the business prospered and he successfully sued his rivals for patent infringement.
13.
The invention of the achromatic lens in 1733 partially corrected color aberrations present in the simple lens and enabled the construction of shorter, more functional refracting telescopes.
14.
In collaboration ( 1827-1832 ) with optician George Dollond, Barlow built an achromatic lens that utilized liquid carbon disulfide . ( Achromatic lenses were important crown glass.
15.
In collaboration ( 1827-1832 ) with optician George Dollond, Barlow built an achromatic lens that utilized liquid carbon disulfide . ( Achromatic lenses were important crown glass.
16.
This led to the invention of the compound achromatic lens by Chester Moore Hall in England in 1733, an invention also claimed by fellow Englishman John Dollond in a 1758 patent.
17.
It was hoped that this would create an " achromatic lens "; a lens that would focus all colors to a single point, and produce instruments of much shorter focal length.
18.
This telescope made by Fraunhofer had a 9 Paris inch ( about 9.6 in ( 24 cm ) ) aperture achromatic lens and a 4 m ( 13.4 ft ) focal length.
19.
This was likely Newton's choice of a way to reduce achromatic lenses, produced an objectionable degree of aberration, so much so that it could affect the perception of a star's position.
20.
In collaboration with John Persehouse Titterton, a local photographer, he prepared a series of photographs of the solar disc over an entire sunspot cycle from 1863 to 1874 using a six-inch achromatic lens.
