53 



to be Ah 44m 16.6s, as the result of all the observations yet made. 

 It is the same as that which Dr. Bowditch had deduced from those of 

 1811 and previous. The longitude of the State House, Philadelphia, 

 obtained by Mr. Walker from the principal observations made at 

 Philadelphia to this time, is hh Om 39.2s. With these longitudes as 

 standards, Mr. Paine's chronometric observations give, 



m s 

 Boston — Philadelphia by 151 Barraud 16 24.27 going from Boston to Phila. 



682 . do. 22.30 do. 



1678 Arnold 24.03 do. 



1 51 Barraud 23.33 returning from Phila, to Boston. 



682 do. 23.60 do. 



1678 Arnold 23.76 do. 

 Philadelphia — Capitol by 151 ^ 



682 > Mean 7 26.43 going from Phila. to Capitol. 

 1678 3 

 151 ^ 



682 > Mean 7 26.50 returning from Capitol to Phila. 

 1678 3 



h m s m s k m s 



Hence, longitude of Capitol =4 44 16.6 + 23 50.01 = 5 8 6.61 



= 5 39.2+ 7 26.46 = 5 8 5.66 



Mean =58 6.14 



Mr. Walker, in a paper read before the Society, March 2, 1838, 

 from a discussion of all the observations then made at Washington, 

 finds the longitude of the Capitol 5h 8m 7s, a value which is pro- 

 bably not far from the truth. 



Thus we have an additional proof, if any were needed, of the error 

 of 25 seconds in time of Lambert's longitude of the Capitol, reported 

 to Congress and adopted by that body. 



The coincidence between the interval from Boston to Philadelphia, 



viz. 



m s 

 By celestial phenomena, 16 22.60 



By chronometers, 16 23.55 



shows that the error of either is reduced within narrow limits. 



The Mansion House, Northampton, Mass., lat. 42° 19' 4.6" by 

 327 altitudes of northern and southern stars, has the following longi- 

 tude : — 



m s 

 Boston — Northampton, 6 17.72 by 74 chronometers. 



Do. 6 17.89 by immersion r Sagittarii. 



Northampton— Philad. 10 4.06 by do. 



