object glass

IPA: ˈɑbdʒɛktgɫˈæs

Examples of "object-glass" in Sentences

"This is the object-glass of our telescope," was the answer.
This apparatus, provided with a powerful object-glass, was very complete.
The boys marked where the thirty-six inches ended, measuring from the object-glass.
While the boys were wondering how the object-glass was to be fastened into the tube, the parson was already doing it.
The boys, of course, now wished to see whether the steeple of the church looked any bigger through this tube and object-glass.
The first, constructed by Herschel, was thirty-six feet in length, and had an object-glass of four feet six inches; it possessed a magnifying power of 6,000.
According to the calculations of the Observatory of Cambridge, the tube of the new reflector would require to be 280 feet in length, and the object-glass sixteen feet in diameter.
The length of this tube is forty-eight feet, and the diameter of its object-glass six feet; it magnifies 6,400 times, and required an immense erection of brick work and masonry for the purpose of working it, its weight being twelve and a half tons.
Secondly, the defining power of the telescope is greatly increased, so that with a good three-and-a-quarter inch acromatic object-glass, with fifty-four inches focal length (mine made by Búron, Paris), I have obtained a clearer view of the physical features of the sun than any described in astronomical works.