6S J. Campbell's Astronomical Observatory. | 
iron, three feet in diameter, and the same in height. It stands — 
upon the three beams before mentioned, is lined with brick, like 
a well, and covered with a smooth round flag stone, projecting af 
inch over the iron. The mahogany frame of the telescope, hav- 
ing four feet, with adjusting screws, stands upon the stone. The 
steadiness of the pier is remarkable, and may be accounted for 
by the fact that the rock in the vicinity lies near the surface, and 
in many cases has been excavated to a considerable depth, to form 
the under cellars of the neighboring houses, which in a great 
measure serves to insulate the walls which support the telescope. 
A map of the Northern Hemisphere, with the figures, is painted 
upon the concave surface of the dome, and the stars to the fifth 
‘magnitude are represented in their proper places. 
8, 
Front and side view of the observer’s seat. 
The telescope is an achromatic refractor of eight inches ape — 
ture, 10 feet 6 inches focal length, made by Mr. Henry Fitz, of 
New York. It is furnished with six eye-pieces, of the Huyge 
nian form, magnifying from 60 to 480 times, and has a finder of 
