ASTRONOMICAL PAPERS. 



91 



LONGrX'UDK y //'f MidMc Po'mt, and of the Leiva Ohfer-oaior^ Wejl of the rhUaddphia Obfer* 

 ■ . '"O'j agn-eahle to the ii?2es rj^ Mi^Jfrs. "Nl'di'on andX)\xoil,- 



Ohfcrvatory in the Forks of Brandywinc Weft of Uie South point of the city itiiL ch. Uu. 



ofPhUadciphia, ^ 31- CO- <^" 



Middle pouit of the Pcninfuhi Eaft of obfervatory hi the Forks, 4. 5* 4^ 



The diff. gives the middle point of Peninfula W. of S. point of Philadelphia, a8. 74. 51 



■lit S. point of Phihidelphia is E. of ohfcrvatory in State-Houfo St][uare, O. a8. 75 



X 



B 



1 

 B 



.'he dif[^ gives the OT^Vr//^ /?oiV// of Peninfuhi Weft of Stute-Houfe ohfcrvatory, a8. ^15. 7 

 iutby your work the middle point is W. of the Lewes obf. 9286,3 pcrchcs,i3=ay. i. j 



I'he difference gives Lewes obfervatory Eaft of the State-Hoiifc obfervatory, 

 from Mafo- and Dixon's lincsj 



76 

 57 



But by your \ .eafure to Newcaftle the Lewes obfervatory was Baft ol the 

 State-lloufe obfervatory. 6;.,6 perches,==^- 



■ * 



So that Mafon and Dixon's lines give your obfervatory more Eaft than your 

 own work, only 



O. ZS- 81 



o, 15. 65 



o. ao. 16 



applied to 5h. o^ 3j'Mhc longiuidc of the State-Houfe oWervatory Weft of Greenwich; the 

 Ittnt^Ilude of the Lewes obfervatory maybe well depended on as ftaled from your own work, 

 to he in time Weil of Greenwich, $\\. o''. 34''^ 



- iV. /?. As Britidi mariners gi^ncrally take their departure from the Land's end of England, 

 as by Mr. Bradley's obfcrvatlons of the htte tranftt of Venus, the longitude of the Lizard Point 

 is now determined to be 5^. 15' W. of Greenwich, if that he fuhtra^led from 75°. 5'. I3",a, 

 it will give the longitude of the Provincial Light-Houfe near the Capes W. of LizardPoint, 



If you think the above can be of any ufe, you may add it to the end of your account. I 

 tliink there is no millake in bringing out tlio different rcfuks; but if I canfind leifurc I will re- 

 examine the work before the flrcet i« ftruck off. I am, with great regard, your's, ike. 



Xi^. Jufy a3, 1770. WILLIAM SMITH. 



To Mr. Owen Biddle. 



A¥ 



r 



Mr, 



JAM 



of 



iftt of Venus -^ as ohfervcd at Providence, In New 

 7, Jiuie 3(i, 1769. 



S it appears by /owe letters of the aftronomer royal, which have 

 been communicated to this Society, that mofi of the Northern 

 ehferverSy both in RuJJia and Szueden^ were greatly di/appointed, by 

 the unfavourable Jl ate of the weather, in their noble and public fpirited 

 endeavours to obferve the late tranftt ; the American ohfervations havt 

 become of the greater importance, in order to a com^arifon with th^fe 

 iif Greenwich, and therefore the Society think it very material to pre^ 

 ferve in their tranfaElions, fuch of the obfervations made on this conti- 

 nent as they have been favour ed with> The account of the Providence 

 •bfervationSy drawn up by Mr, West, was tranfmitted by Mr, 

 Joseph Brown, and being laid before the Society by Dr, Smith; 

 the following abftra^ thereof was ordered to be publi/bed at a meeting, 

 May iSih, 1770. 



WHEN 



