l^Z 



MATHEMATICAL and 



INTERNA!. 



Names of 

 places. 



Reg. cir- ^ xi 

 cLimf. in ^ > 



Greenwich, 

 Spital Square, 

 Middle Temple, 

 Kew, 



Windfor Ca/lle, 

 Shirburn Gallic, 

 Oxford, 

 Glafgow, 

 Upfal, . 

 Stockholm. 



h. m. fee. 



7- 28. 31 



6 .%j 

 A o j 



C O N T A C T." 



Calcui.l Thread I^ . Long, in Cal. acce- 



Long, in accelcra- [ of light 

 time, from tion in , com- 



Norriton. 



h. m. fee 

 J. I. ^gJi. 



time, by 

 Parallax. 



feconds. 

 423,831 



plcte. 



time, from 

 Norriton. 



Mean 



Norriton, 



8- 39- 54 

 B. 41-17 

 8. 16. '34 



2. 30. 6 



3 



6. x%. 15 



^ |6- 13- SS 1416,769 



418,247 



- j5- 49- 13 

 3 I - 



4x9,6123 



238 . - 



XJitf. 



leration 

 in tiniLv, 

 by pa- 

 rallax. 



feconds. 

 29 E. 47,4,768 



,424,741 



424,701 



J424,454 

 424,221 

 424,103 



423,956 

 421,01 



Thus tke true mean difF. of") 



meridians of iVornVa« and | 



the three places where ]► 5. 45?. ij 



the reg. circumferences I 



are noted in contatSt, is J 

 Both the mean diff. of mc-T 



ridians, by the obferva- y 5. 46 af? 



lions, is 



h. m. fee. 

 7. 29. 18 



7. 29- I5i 

 7. 28. 49^ 

 7. 28. 17 



7. 26. 37 

 7. 25. 24 

 7. 24. 20 



7. 12^ Ij 

 K. 40. 16 

 H. 41. 47 



7.40.37,8 

 2.30.26 



[rri^rr,«i - i . . . "-"^n^r^^i 



I In like manner, for the ten phicey, 

 which noted the completion of the 

 thread of hght, for the internal con- 

 tadt ; we have — 



But, V the obferO 



vations,themeanC5. 10. Ii,8 

 diif. mend, is 3 



\S' -12. 44,95 (422,61/ 



' ' - - - '230,07? 





2. 45=l6i" 



The diff. of thefc two, isT 



the mean obferved cffet^t C : 



of Parallax, - - j 



But the mean calcukted efTcd of 7 ^ „ . 

 Panillax, is ^181^6123 



And, 181^6123 ::i'>5" :: 8",52I2 : 7^742, 

 Whence, 7",742==0's Parallax. 



■m.^s 



The diff. of thefe 

 two, is the mean, 

 obferved eiFca( °'^'^^*^-J 

 of Parallax, ^ 



But the mean calc"^Iated7 o ,. o 

 effea of Parallax Is ^ ^ ^,842 . 



And, 



'^^3^84 : i53'/,i5 : : W,^%x% ; 7/^,08 



Both thefe refults are the fame a. the mean refults of their refpedi ve 'l\-^^ iJo^ b"v IheVen-i 

 rate companfons in the foJlowintr table, ^ ' ^^ ^^ ^"^ ^^^^ 



I N T'e'R ^ AL. C (J N 1' A C 'f ' 



Comparifons fr om the regular circum ferences in'rnnf.,c> 



JSIorrtion and Greentuicb. ' ~~~" aT ~, Ttt r ,' 



H. m.fec. Seconds. " - '■ ^'^^■rUon and Upfal. 



2. 30. 6. Norriton. A'X?,Mt Grce.ni.vich. 



5. I. 29.— diff. merid. 238. Norrilon. 



7- 3T. .^5. _ i«5.S2i - 



7. 28. 31, Greenivkh. — _x^' 82I 



H.m.fcc fe,„„^j^^ 



2. 30. 6. Norrilon. 418,247 Upfaf 



6- 12. ij.^diff merid. 238:..^ ;Cl«. 



3. 4---i84^ 



Sun's Parallax=3^^44. 



2. 



6. 



Norriton and Stockholm. 

 ZO. 6. Norriton. Al(>,7(><) StacHwlm. 



13- 55- =^diff. merid. 238,--- Norriton. 



8. 42. 21. 



8. 39- 54. Up/hi. 



180,347 



•3 3", 247 



a. 27=-=i47/'. 



Sun's Paranax=:6/',t>5. 



The }nean of thefethree comparifonsglves th. 

 Sun's Parallax 7^', 74. ^ 



8. 44. I. 



8. 41. 17. Stockholm. 



178,769 



14^605, 



2. 44- — 164^'. 



Sun's Parallax^7''',82, 



PPuvfr^ 



Comparifons 





; 



