54 



This immersion of t Sagittarii was observed, Aug. 22d, 1836, as 



follows : — 



h m s 

 By R. T. Paine, at 10 14 57.46 at Mansion House, Northampton. 

 By W. C. Bond, at 10 23 20.90 at his Observatory. 

 By S.C.Walker, at 10 1 7.30 at N. 4.4", W. 1.06s of S. House, Ph. 



Again, for the longitude of Brown University, Providence, Mr. 

 Paine finds, 



m s 

 Boston — Providence, 1 22.64 by 40 chronometers. 



Do. 1 22.29 by eclipse of May 15th, 1836. 



Mr. Paine's observations of the eclipse of Sep. 18th have already 

 been reported. Those for latitude and regulation of chronometers 

 have been stated more at length, in order to furnish examples of the 

 method pursued by that gentleman in the chronometric survey of 

 Massachusetts, the only work of the kind of much extent hitherto 

 performed in this country. Some idea of the labours of Mr. Paine 

 may be formed from the fact, that, during its progress, he has been 

 under the necessity of making and reducing more than 100,000 ob- 

 servations of altitudes of the sun and stars, without any assistance. 



It is proper to add that Mr. Gilliss' observations, already reported, 

 appear to require a subtractive correction of 1.95s. Thus Mr. Paine's 

 observations give, 



h m 

 Sep. 18th, 21 25, Barraud 151 fast by its own rate -f- 19 

 by comparison with 682 Barraud, 

 1678 Arnold, 

 by mean of three chronometers, 

 by Mr. Gilliss' transit observations, 

 Discrepancy, 



Professor Henry read a paper entitled " Contributions to 

 Electricity and Magnetism, No. 3. On the Phenomena of 

 Electro-dynamic Induction." Referred to Prof. A. D. Bache, 

 Dr. Patterson, and Dr. Hare. 



The primary object of the investigation undertaken by the author, 

 was the discovery of induced currents from ordinary electricity, simi- 

 lar to those produced by galvanism. Preparatory to this, a new 

 investigation was instituted of the phenomena of galvanic induction, 

 and the result of this forms, perhaps, the most important part of the 

 communication. 



m 

 19 



s 

 20.80 





20.91 





20.89 



19 



20.87 



19 



22.82 





1.95 



