38 



MATHEMATICAL and 



Meffrs, M 



fettle the longitude of Philadelphia, to the exadnefs here 

 requifite, I wlfli, therefore to receive the obfcrvations of 

 the eclipfes of Jupiter's fatellitcs, made there in the fpring 

 of this year, of which Dr. Smith makes mention. Thofe 

 ^^hich have been made here, I have fet down on the 

 ^next page, and requeft you will be pleafed to fend them 

 to him, with my bcft compliments and congratulations on 

 his and his fellow obfervers fuccefsful labours. I wilh al- 

 fo to have an account of the difference of latitude and 

 longitude between the Philadelphia ohjervatory, and the 

 two other obfervatories at Norriton and the Capes of De- 

 laware; and alfo how much the State Jloufc fquare dif- 

 fers from the fouthermoft point of the city of Philadelphia, 

 to which Meffrs. Mafon and Dixon have referred, their 



obfervations. 



" When you receive any furthef account of the Penn- 



fylvania obfervations, promifed by Dr. Smith, or any other 



American obfervations, I fliall be obliged to you for a 



fight of them. 



'^ I beg you will accept of the enclofed account of my 



obfervations of the tranfit, and of the eclipfe of the Sun, 



June 

 noted 









3d. You will perceive that fevcral phoenomena 



Norriton 



they have further obfcrved a curious circumftance at the 

 fu'ft entrance of Venus, which the low altitude of the Sun 

 did not permit me to obferve here; as, on the other hand, 

 fome phoenomena were noted here, which they have not 



taken notice of. 



" In a few days I will do myfelf the pleafureto leave fome 



of my pamphlets with you, which I beg you would fend 

 to the Pennfylvania obfervers, when you have an oppor- 



J 



i 



F 



I- 



I 



1- 



tumty 



I am, S I R, 



Your very humble Servant 



NEVIL MASKELYl 



I, FJq. 



)> 



The 



* They are inrcrtcd above at the bottom of page ao. 



^ 

 s 



