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Great change of rate, as christian louboutin discount from sidereal to lunar time, is effected by an ingenious piece of differential gearing tiffany jewelry outlet small changes are made by a cam adjustment moreover it rings seconds, for the double object of christian louboutin outlet comparing its rate Hermes kelly with a chronometer and to assist the observer in his observations. 3. The Committee are strongly impressed by the great convenience to the observer of the arrangements of the tiffany & co outlet hour and polar-distance circles, the facility of controlling their adjustment, and the easy access to the christian louboutin outlet tiffany jewelry outlet eyepiece.
4. The stability of the tube was tiffany & co outlet severely tested, both in respect of its general stiffness and its power of resisting torsion, such as might be produced by the weight of the small speculum when the telescope is off the meridian and the results were highly satisfactory. 5. In christian louboutin sale large reflecting telescopes it is usual to make provision for keeping christian louboutin shoes a given diameter of the great spjculum always in a vertical plane. When tiffany outlet they are equatorially mounted, this is done by rotating the tube in its cradle. Here the tube does not turn but there is a special arrangement of hoop-suspension, by which, whatever diameter may be vertical, it is supported in a uniform and symmetrical Hermes birkin manner. The system of trian gular levers at the back of the great speculum is also contrived so as to prevent them from exerting any pressure which might distort it.
This is a matter of the highest importance, and the attention of the Committee christian louboutin discount was specially directed to it. They examined it most carefully, putting the telescope in various positions of JR. and P. D. on each side of the meridian, both by day and tiffany and co outlet night, and could not find any sign of flexure christian louboutin sale christian louboutin shoes or Hermes bags any distortion of the image in any of these changes. 6. In order to test the optical power of the second speculum B the first Hermes outlet one, A, had been tried and approved by a member of the Committee on October tiffany outlet 12 last , the telescope was directed to the following objects In Hermes bags outlet the daytime Venus and a tiffany and co outlet Andromedre at night which fortunately was cl ear and steady Castor, the Great Nebula of Orion, Orionis, y Andromedae, Uranus, 1 Messier, 37 Messier,.
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