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When the light was allowed to fall upon the object-glass, every different thickness of the plate of air between the object-glasses gave different colours, so that the point where the two object-glasses touched one another was the centre of a number of concentric coloured rings.
It was difficult for her to hold the telescope steadily enough to keep the object-glass upon the black spot, and she had a great deal of trouble in the matter of focusing, pulling out and pushing in the smaller cylinder in a manner which showed that she was not accustomed to the use of this optical instrument.
He would naturally see nothing whatever were it not that a second plane mirror is fixed at the "elbow" of the instrument, so as to send the rays which have traversed the object-glass to his eye. He never needs to move from his place. He watches the stars, seated in an arm-chair in a warm room, with as perfect convenience as if he were examining the seeds of a fungus with a microscope.
Some of the fibres are thickly covered with extremely minute spicula, occasionally aggregated into little tuffs; and hence they have a hairy appearance. These spicula are of the same diameter throughout their length; they are easily detached, so that the object-glass of the microscope soon becomes scattered over with them.
The turret was crowned with gold. As I opened the door and stepped inside, I saw a large telescope and a few chairs. The observer's chair was upholstered with velvet. It was not a complicated observatory like the worldly ones.... I removed the cap of the great telescope, covering the object-glass, and then uncovered the eye-piece. Follow me."
In this case she adopted a ball-and-socket joint the kind by which older astronomers mounted their telescopes. By such a joint the telescope becomes, just as the head is, a lever of the first order. The eyeglass is placed at one end of the lever, while the object-glass, which can be swept across the face of the heavens, is placed at the other or more distant end.
'About three years ago, in the course of a conversational discussion with Sir David Brewster upon the merits of some ingenious suggestions by the latter, in his article on Optics in the "Edinburgh Encyclopædia," p. 644, for improvements in Newtonian reflectors, Sir John Herschel adverted to the convenient simplicity of the old astronomical telescopes that were without tubes, and the object-glass of which, placed upon a high pole, threw the focal image to a distance of 150 and even 200 feet.
From the line which Master Negus was able to see distinctly with the aid of one of Mr McCarthy's fine red hairs neatly adjusted across the object-glass of his telescope the ship had a splendid run over to the South American coast, following the usual western course adopted by vessels going round the Cape of Good Hope, in order to have the advantage afterwards of the westerly winds and get well to the south; and, when she had reached the thirty-fourth parallel of longitude and latitude 18 degrees 22 minutes south that is, about midway between Bahia and Rio Janeiro, her head was turned to the south-east with light winds from the northward and eastward, and she began to make way towards the "Cape of Storms," after getting to the southward of which she would have a straight run due east to New Zealand.
I had an abundance of money, few desires that were not bounded by my illuminating mirror on one side and my object-glass on the other; what, therefore, was to prevent my becoming an illustrious investigator of the veiled worlds? It was with the most buoyant hopes that I left my New England home and established myself in New York. My first step, of course, was to find suitable apartments.
He had once or twice seen seals disporting on these rocks, and on one occasion a sea-lion, an estray from the familiar rocks on the other side of the Golden Gate. But he ceased work in his garden patch, and coming to his house, exchanged his hoe for a telescope. When he got the mystery in focus he suddenly stopped and rubbed the object-glass with his handkerchief.
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