x^ 



90 MATHEMATICAL and- ■ 



My companion Joel Bailey was not fo well proYided 

 with a tclcfcope. He had one of Do Hondas double objedl 

 lens refrading glaffes of about four and an half feet length. 

 This, with a ball and focket, was fixed to a poft, which 

 made it very convenient for obfervation. Thus furnifhed 

 we found the contadls take place as follows. 



Joel Bailey's external contact was loft by an accident, but 



{een by him after ithad taken place, at 2^. 14 



The internal contact, by do. 

 External contaCt, as fecn by Owen 

 Biddle, . - ^ - 



The internal conta6l by do. 





32 



2. 14 



2-32, 



30 



8 

 8 



8 



ap. t. 



Thefe obfervations are reduced to appar, time. And it 

 mufl be noted, that the time of the internal contad", as 

 given by Owen Biddle, is 4 feconds before the thread of 

 light had broke the dark ligament by which Venus's limb 

 was united to the limb of the Sun, that being the time he 

 eftimated the two limbs to be in contact. Alfo, that as the 

 external contad occurred fpcedily after he went to his te^ 



lefcope, he will not prelume to aflert that he has the time to 

 a fin^^le fecond, yet he conceives he has given the exa£l: 



time of that contact, as he is not fenfible of any error 



therein. 



The foregoing being an exadl diary of our tranfadtionS) 

 we fubmit the fame to the fociety, and hope for their ap- 

 probation, OWEN BIDDLE. 



i». S. Since the foregoing was drawn up, I received from Dr, Smith the followln,^ note; 

 •which ^ives me pleafure to Hud i'o little diiTerencc between the refult of Churleg Maion and 

 Jeremiah Dixon's meaiurtnient and our own. 



Dear Sir, 

 SINCE you fiuifhed your mcufurcmciit frotTi Newcaftle Court-TT ^iT: to the Philadelpliia 

 ohTervatoryiii tlic Stale-Horire Square, the 58th volume of PhilofophiciilTranfac^ions has come 



¥-* 



ahnoll entirely the fame from their work as from yours, akhongti ohtaincd by different routs*^. 



LONGrrUDE 



* The refult by Mr. Biddle's rout is got, by going from the State-Houfe olifrrvatory to 

 Newcatlle Court-Houfe, agreeable to his meafurement; thence by the I zm. radius and tan- 

 gent line to the middle poh'u. The refult by Meifrs. Mafon and Dixon's work is got, by be- 

 ginning at the fouth point of the city of Philadtdphia, (or the place of their obfervatory,) on 

 trie north fide of Ccdar-ftrcct, between Front-flreectand Delaware; thencctotheirobftrvatory in 

 the Forks of Brandywine, which h 31 milea Weft, and lo'^5 South of the fouthermoflpoirit 

 of the city; thence by tJic other Unes of latitude and departure, wherewith they connedl the 

 obfervatory in the Forks of Brandy wine, with the middle point of thft Peniufuk. See their 

 work in the volume of "Tranfaclions, (quoted above. 



■w^ 



