124 



BENJ. PIKE'S, JR., DESCRIPTIVE CATALOGUE. 



conveniently and steadily, having a brass pillar movable by 

 a tooth and wheel adjustment by which it may be set at 

 any height required with vertical brass joint and horizontal 

 motion, and rack and pinion motion to the tubes ; the length 

 of the tube is five feet, the aperture is three inches, having 

 terrestrial and celestial eye-pieces. The construction of the 

 various parts may be understood by reference to the one 

 previously described. Price, $150.00. 



Fig. 133. 



Another form of these splendid astronomical instruments 

 is represented in the above cut, Fig. 133, of a larger construc- 

 tion than the preceding ones, and is mounted on a stand of 

 a new and highly approved construction. It possesses the 

 advantage of supporting the telescope in two places, which 

 renders it extremely steady, a property of great importance 

 when viewing celestial objects with high magnifying powers. 

 It possesses, likewise, the advantage of enabling the observer 

 to continue seated at the same height from the floor, although 

 the telescope be raised to any altitude, the elevation being 



