24 PROCEEDINGS OP THE AMERICAN ACADEMY 



the maker of the telescope, and the result proved very satisfactory. A 

 negative eyepiece was used iu observing the contacts. 



The timepiece used was the pocket-chronometer Patek, Phillipe, & 

 Cie. 34,807. 



W. H. Pickering. 



The instrument selected for the observations was the Bowditch 

 Comet-seeker ; but as dew upon its reflecting prism prevented obser- 

 vations with it at ingress, the Quincy Comet-seeker, a smaller instru- 

 ment, was employed in observing the second contact. No complete 

 record of these observations was secured, owing to the circumstances 

 explained in the notes relating to Mr. Edmands's observations. The 

 estimate of the time of contact is based upon the circumstance that 

 the observer's signal " Past " was given one second later than the cor- 

 responding signal by Mr. Edmands, according to the judgment of both 

 observers. But on consideration, previous to any comparison with 

 other observations, it appeared likely that this signal " Past " was 

 given a little too early. The observer, therefore,, assigned for his 

 observation of contact a time three seconds later than the original 

 estimate of Mr. Edmands for the time of his own signal. 



The Bowditch Comet-seeker was used at egress. 



Observers at other Stations. 



The following observations of the transit have been communicated 

 to me for publication, and are here inserted. 



1. Station, the establishment of Messrs. Alvan Clark & Sons in 

 Cambridgeport, Massachusetts. Approximate latitude, -|-42° 21' 16" ; 

 approximate longitude, west of Greenwich, 4'' 44" 26^7. The times 

 are given according to the clock signals of this Observatory. 



Observer, Alvan G. Clark. Second contact, 2P 40" 3'; third, 



3*^ 2" 30' (the observer has no doubt that the minute should be 3 



instead of 2) ; fourth, 3'' 23" 54^5. 



Observer, C. A. R. Lundin. Third contact, 3*^ 3" 13'; fourth, 

 3h 23m 34s_ 



Reducing these observations to Greenwich mean time by the ad- 

 dition of i^ 44" 15^5, we have, for Mr. Clark, 2*^ 24" 18% 7*^ 47'" 46% 

 8"^ 8" 10' ; and for Mr. Lundin, 7" 47" 28% 8" 7" 50^ 



2. Station, near St. Paul's Church, New York. Approximate 

 latitude, -["40'^ 46'.0 ; approximate longitude, west of Greenwich, 

 4" 56" 0^ Observer, Rev. G. M. Searle. Telescope by Dollond ; 

 aperture, 2.65 inches ; focal length, 44 inches ; magnifying power, 60. 



