ASTRONOMICAL OBSERVATORIES. 



285 



tower, 20 feet in diameter, which revolves on eight cast- 

 iron balls upon an iron track. The wings are each 

 18 feet square. The east wing is designed for a com- 

 puting room; the west wing is designed for a transit 

 room, and it commands a fine meridian. The transit 

 pier- is built of limestone. It descends six feet below the 



HA3ULTOX COLLEGE TELESCOPE. 



surface of the ground, and is eight feet by five at the 

 top. In the center of the main building is the large 

 pier, built also of limestone. It descends six feet below 

 the surface of the ground, is ten feet square at the base, 



