ARTICLE IV. 



Astronomical Observations made at Hudson Observatory, Latitude il" 14' 37" 

 North, and Longitude 5h. 25 m. 425. West; with some Account of the Building 

 and Instruments. By Elias Loomis, Professor of Mathematics and Natural 

 Philosophy in Western Reserve College, Hudson, Ohio. Read October 4, 1839. 



Hudson Observatory comprises a central room and two wings. Exter- 

 nally, its entire length is thirty-seven feet, and the breadth of the centre sixteen 

 feet. The foundations are of hewn sand-stone, and the walls, which are of 



brick, are one foot in thickness. The transit room is represented upon the left 

 hand in the annexed figure. It is ten feet by twelve upon the inside, and seven 



