16

STANDS FOR REFRACTING TELESCOPES.

These stands may be divided into two general classes—the Altazimuth and the Equatorial. But there are several varieties of each class, a few of which demand attention as being those most generally employed.

The simplest form of Alt-azimuth stand is called, from the shape of the foot, the pillar and claw stand. The claws are generally hinged, so as to close together and pack into a smaller space (Fig. 3).

The additions capable of improving this stand are, firstly, screw movements in altitude and azimuth, thereby allowing much more even motions to be applied than is possible by the hand alone, and, secondly, sliding steadying rods with universal joints, one end fixed to the telescope and the other to the stand. All the stands just described are intended to be used upon a table or other elevated place, the next form obviates this, and is generally known as the tripod, or garden stand. The claw feet of some stands

Fig. 3-

The Pillar and Claw Stand.

sometimes take off, and the pillar can then be screwed to a stout metal pin forming part of a casting, jointed to which are three wooden legs. The pillar is often discarded as well as the claws, and then the movements are brought nearer the casting, thereby ensuring greater steadiness. The above are the principal forms of Alt-azimuth stands for refractors, but an Equatorial costs very little more than an elaborate Alt-azimuth and is greatly to be preferred.

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