_ m _ ^—. 



wi 



178 



M A T H E M A T I C A I 



AND 



'^ 



final], that it was not thought worth while to repeat any 

 more of the calculations on that account; efpecially as the 

 final determination of the Sun's parallax, from the late tran- 

 fit, as was hinted already, will not be left to depend on our 

 calculations in America. I fliould have been glad, if time 

 had permitted, to have gone over the work a fecond time, 

 to be fure of its corrednefs. Some of the calculations were 

 made by Mr. Rittenhouje and myfelf jointly, and of the re- 

 fidue, made by myfelf fmgly, which were the greateft part, 

 we have here and there fele£led out fome re-examination. 

 And though, among fuch a multitude of figures, as necef- 

 farily entered into thefe calculations, it is difficult to avoid 

 miftakes wholly, either in writing or printing, yet I think, 

 there can be none of any fignificancy. 



Meteorological Observations mmk ai PhiladdplAa^in Vcccmher^ 1770; and in January^ 

 andpart of February^ ^771- ^y Thomas Coombs, T^i/y. Commimkated by Dr, Smith. 



■^HOUGH part of the following obfcrvations ought not, i;i the order of tirno, to come 

 * into this volume, yet the finguUr moderation of the weuthor, for more thtiu ten weclta of 



what is ufually the fevcrcft part of our North-American wititcrs, makes it proper not to fepa^ 

 rate obfervations which many people will wiHi to prefervc entire, for a comparuou with future 

 winters, when we fhall be favoured with any of the like mildncfg, 



DECEMBER, 



177a 



•--1 



3 



4 



5 



6 



7 

 1/ 



10 

 13 



12 



1."' 



o 



I 



«.x 



14 



13 



9 a.m. 



30. 



2 p.m. 



29. 



9 a.m. 



.30. 



2 p.m. 



30. 



9 a.m. 



30. 



2 p.m. 



30. 



9 a.m. 



30. 



9 a.m. 



29. 



9 a.m. 



29. 



2 p.m. 



29. 



9 a.m. 



30. 



2 p.m. 



29. 



9 a.m. 



29. 



8 a.m. 



29. 



f) a.m. 



29. 



2p.m. 



29. 



9 a.m. 



30. 



2 p.m. 



29. 



9 a.m. 



29. 



2 p.m. 



29. 



9 a.m. 



29. 



2 p.m. 



29. 



9 a.m. 



1 30. 



2 p.m. 



30. 



9 a.m. 



30. 



9 a.m. 



30, 



2 p.m. 



29. 





9i 



4 



H 

 H 



I 



9l 



i 



7-1 

 9 



rhermJ 

 Farcnh . 

 op. I in 



id 

 Cl- 



air. 

 39 



30 

 J 3 



d. 



3 2 

 3^ 



n. 



n. w. 



ditto. 



ditto, 

 29 \ ditto. 



33 ,w.n.w. 



32 j 1; w. 



40 j ditto. 



434 n- ■^• 

 3 r. I36 i ditto. 



.i>(y^Z^\ n. 



43i- 



.1? |37 

 ,i3 36 

 36 |40 



38-i'4.i: 

 41 



43 

 43 



35* 

 3^ 



39 



-JO 



39 , 



43 



43 



41 



41 



39 

 33 



44- 



w. 

 f. w. 



ditto, 

 ditto, 

 n. e,, 

 ditto. 



n. 

 ditto, 

 n, w. 

 ditto, 

 n. w. 



w. 



f. w. 



ditto. 



clou. 



do. 



fair* 



clou, 



fair 



do. 



do. 



cloiu 

 do, 



do. 



fair 



do, 



do, 



do. 



do. 



do. 

 ciou. 



<lo. f 



do. 



do. 



fnow 



clou, 



fair* j: 



do. 



do. 

 do. 



do. 





o 



W 



17 



9 a.m. 

 2 p.m. 



j 2 p.m. 

 J '9 a.m.' 

 ', 2 p.m. 

 20 9 a.m.' 



^j9a.m. 

 j2 p.m. 



j 2 p.m. 



^ '9 a.m. 

 ji p.m. 

 '9 a.m. 

 j 2 p.m. 



^5 



9 a.m. 



!2 p.m. 



26 9 a'"^' 

 j2 p.m. 



217,9 ''^'^'^' 

 ^g'9 a.m. 



12 p.m. 



29 9 a.m. 



29. 

 29, 



30. 



30. 

 29. 



29. 

 29. 

 29. 

 29. 

 29. 

 29. 

 29. 

 29. 



3 o. 



8i 



a:] 

 94 



s 



6 



Therm. 



Faronh, 



op. ( in 



42 



45 



37 



44 

 40 



49 



37 



43 



47 

 32 



42 

 46 



43'. 

 44 



45 

 48 



42 



45 



47 



35 



34i3fi 

 32 =36 





30 



31 



19 ''^'^"■ 

 2 p.m. 



9 a.m. 



2 p.m. 



a. 



* 



w. 



n, w. 

 ditto. 

 f. w. 



n. w. 

 w. 



f. w. 



n. w. 

 ditto, 

 n. e. 

 n. n. e. 

 f. w, 

 n. w. 



n. 

 n. w. 



f. w. 



w. 



ri. e. 

 ditto. 



n. 

 w, 



ditto, 

 f. w. 

 n. e, 



ditto. 





* Snow the proceeding night, f Rain at times, \ A Hiarp fro/l in the night, § 



the night. 



er 



clou. 

 do. 

 do. 

 fair 



clou. 



fair 



rain 

 clou, 

 w k. 

 clou, 



fnow 

 clou, 



do. 

 do. 



do. § 

 do. 



fair 



do. 



do, 



do. 



do. 



fair 



do. 



do. 



rain 



clou, 



JANU^ 



Snow ill 



S 



^ 



« 



