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ASTRONOMICAL PAPERS. 



83 



Me 



cury were meafurcd upon a very large projedion, for that 

 purpofe, adapted to the apparent times of the micrometer 

 meafures, and applied to the projedion. By thefe, the 



Me 



feen at 



Philadelphia; and fmall circles were drawn round them, 

 with the radius 4^)238, to reprcfcnt his dilk on the face 

 of the Sun. From the limbs of the Sun and Mercury, 

 lines were drawn in the diredion of their centers, of the 

 precife length exhibited in the foregoing table of mea- 

 fures. 



Upon the whole, I have given a full and faithful account 



of our obfervations of the tranfits of Venus and Mercury, 

 n the foregoing flieets; and if they fliould be found, in 

 the conclufion, to contribute any thing to the advancement 

 of aftronomical knowledge, it muft relied an lionor on our 

 new obfervatory, and give pleafure to all the lovers of 



fcience, as well as to, 



Gentlemen, 



1 



7' 



Your mod obedient 



And very humble fervaut, 



1769. 



JOHN 



\ 



of the Tranfit of Venus, over the Snn^s Difk 



J' 



'b/crved near Cape He 



3d, 1769. 



on Delaivare Bay^ 

 Joel Bailey, and 



Draivn up By Owen Biddle. 



A 



GREEABLE to the appointment of the American 

 Philofophical Society^ to obfervcthe tranfit of Venn 

 at the light-houfe, near Cape-Hen lopen, I fet out by wa- 

 ter from Philadelphia, accompanied by Joel Bailey, and 

 Richard Thomas, the latter of whom had offered to accom- 

 pany us at his own expence, and proved very ferviceable 



in the affiftance he gave us 



(M 



— — _ — — ^_ ^^ ^ ^ ^ 



Town^ and immediately endeavoured to gain fuch informa- 



tion 



