336 Dr. Prince’s Description of anew Stand 
top of a small pedestal, or pillar; the other end is unconnected, 
This pedestal is placed on a square piece of hard wood, which 
slides on a brass plate between two parallel grooved rulers across 
the centre of the circular board ; and may be fixed at any part of 
the diameter when the Telescope is brought nearly to the ele- 
vation required. The pedestal is then fixed by a finger screw, 
seen in Plate V. fig. 2. The opposite end of the sliding part 
of the double bar is connected by a strong joint with the eye-end 
of the telescope; and being movable in the collars, an accurate 
adjustment of the instrument is made by the rack-work. 
For so large a telescope, I prefer the double bar to the brass 
sliding tubes commonly fixed to achromatic telescopes to give 
them steadiness ; and also the method here adopted of sliding 
across the circular board to give different elevations to the tel- 
escope, to that of fixing one end permanently, and shifting the 
other end to another place, as the sliding tubes are used. My 
Telescope is so placed on its axis that the centre of gravity is 
between the axis and the eye-end; so that the tube rests on two 
supports, the axis and the double bar; for the sliding part of 
the bar does not move so easily, but that it gives sufficient sup- 
port to the end with which it is connected. And being perma- 
nently fixed to one place, more vertical steadiness is given to the 
Telescope than could he preserved by shifting it to another place 
nearer to the axis;, as is done with the sliding tubes, to give a 
greater elevation. When the pedestal is placed at the end of the 
rulers farthest from the eye-piece; and the double bar is 
brought to its shortest dimensions, the Telescope has an eleva- 
tion of 65° above the plane of the circular board. When the ped- 
estal is placed at the end of the rulers, nearest to the eye-piece, 
and the sliding bar drawn out to its greatest extent, the object-end 
