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Updated: July 19, 2025
His first telescope, made of two lenses fixed in a lead pipe, was soon followed by others of improved types, Galileo devoting much time and labor to perfecting lenses and correcting errors. In fact, his work in developing the instrument was so important that the telescope came gradually to be known as the "Galilean telescope."
Every morning at break of dawn scores of Belgian machines and the same is true all down the Western Front rise into the air, and for hour after hour swoop and circle over the enemy's lines, taking countless photographs of his positions by means of specially made cameras fitted with telescopic lenses.
M. Fresnel mentions that lenses had been used in England so far back as 1789, in the tower light-room at Portland Island, but from some cause or other were discontinued.
"Said to him: 'Chevalier, since you have nothing to do, just sit for Philippe the Bold. 'With pleasure, said Chevalier. Montalent told him to assume the attitude of a man bowed down with grief. More, he stuck two tears as big as spectacle lenses on his cheeks. He finished his picture, forwarded it to Carthage, and had half a dozen bottles of champagne sent up.
The reader may readily comprehend the phenomena of refraction, by means of light passing through lenses of different curves, by reference to the following diagrams: By these it is seen that a double-convex lens tends to condense the rays of light to a focus, a double-concave to scatter them, and a concavo-convex combines both powers.
"That headset thing was child's play to him, but he doesn't like the looks of this other stuff at all. I don't blame him a bit I wouldn't like to be on the receiving end of this hook-up myself. I'm going to put him on the recorder and on the visualizer," Seaton continued as he connected spools of wire and tape, lamps, and lenses in an intricate system and donned a headset.
Like a great lighthouse, with its mighty lamps ever burning and its reflectors and lenses kept clean and clear, Carleton, never discouraged, terrified, or tired out, sent across the troubled sea and through the deepest darkness the inspiriting flash of the light of truth and the steady beam of faith in the Right and its ultimate triumph.
"All right," said Lund. "Will you do that, Rainey? Now?" And Rainey had a fleeting fancy that the giant winked one of his blind eyes at him, though the black lenses were deceiving. He went below immediately and rapped on the door, a little surprised to see the girl appear in the opening. He had expected to find the skipper alone, and he was pretty sure that Carlsen had also expected this.
All panes of glass containing those oblate spheroidal knots familiarly known as "bull's-eyes" were ruthlessly destroyed, in the hope of obtaining lenses of marvelous power. I even went so far as to extract the crystalline humour from the eyes of fishes and animals, and endeavored to press it into the microscopic service.
Smith has determined that as early as the opening years of the fourteenth century such lenses were in use, but this proves nothing as regards Bacon's connection with their invention. The knowledge of lenses seems to be very ancient, if we may judge from the convex lens of rock crystal found by Layard in his excavations at Nimrud.
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