ASTRONOMICAL OBSERVATORIES. 



211 



GBOTTNT) PL4JS OF HT7D80K OiJBEEVATOBY. 



The center room is occupied by the equatorial. It is 

 14 feet square on the inside, and is surmounted by a re- 

 volving dome of nine feet internal diameter. The equa- 

 torial pier descends six feet below the surface of the 

 ground, and, like the transit pier, has a slope of one inch 

 4a the foot. 



