334: HISTOBY OF ASTRONOMY. 



In March, 1851, the difference of longitude between 

 Charleston and Savannah was determined by telegraph. 

 At the Charleston end, the observations were made by 

 Professor Lewis K. Gibbes, at his observatory ; and at the 

 Savannah end by Mr. C. O. Boutelle. Thus the Seaton 

 station at Washington was connected with Savannah, the 

 difference of longitude between Charleston and Washing- 

 ton having been determined in the operations of the pre- 

 vious year. 



In December, 1851, was determined the difference of 

 longitude between Cambridge, Mass., and Bangor, Maine ; 

 and also between Bangor and Halifax, Nova Scotia, un- 

 der the general direction of Professor S. C. Walker. 

 Professor Bond, of Cambridge, and Captain Shortland, 

 of the British Admiralty Survey of Nova Scotia, had 

 concerted the connection of these two places by the tele- 

 graph; and it was considered important to furnish an 

 intermediate station in Maine, and to connect the Survey 

 of the United States with the British Survey. The 

 operations were entirely successful, as far as Cambridge 

 and Bangor were concerned, but the number of signals 

 exchanged between Bangor and Halifax was small. 



The difference of longitude between Seaton station, at 

 Washington, and Eoslyn station, near Petersburg, Ya., 

 was determined by observations made on six nights 

 between July 3 and August 7, 1852. The chief object 

 in these observations was to examine the influence of the 

 different circumstances producing errors in the longitude 

 determinations by this method. In determining the 



