5tt OBSERVATIONFS 



Inde 1°. ex quantitatibus (A) et(AX elicitiir Inclinatio az7(J°: 44,' 

 - :i°. - - - - (B) et(Br - - - - r:7(J: 21 



Inclinatio ergo ex his experimentis deduda eft 

 *76l grad. 



Die 22" Martii BernOVLLIANAM metlio- 

 dum , ope acus Petropolitanae in vlum\ocaui, vim 

 niagneticam pro viribus imminui , inclinationesque 

 inter 70° et 80° gradum obferuaui , angulus indi- 

 cis femper quinque gradibus , angulum inclinationis 

 acus fuperabat, et intra circiter 19 minut. fecnnd. 

 quatuor ofcillationes 5 feu 7 graduum acus perficiebat. 



Acu dein rurfus maxima vi magnetica imbu-* 

 ta , quatuor ofcillationes intra 13 feu 14. minut. 

 fecund. abfoluebantur , et incliuationes fequentes ob- 

 feruaui. 



Indice zo. Inclinat. erat ^137*: 35^ Different r - - - 



- - =79 - - - -7^; 25 , . -30. 35/ 

 ^ - ^80^ - . . -75: 4.5 - . ^^, 15 



- — 803 - - - —"76: 00 - - —4: 30 



- - =81 - - - ~y6: 25 ' - -4.: 35 

 ■ ' " ^Sij -^ - ' z:75: 40 - ■=- 1:4; 50 



- - -82 - - . ^75: 25 . . :^5. 35 



- - r83 - - - -77: 00 - - -6: 00 

 Ex his vera inclinatio inter 76°: 25^ et 7^°: 40^ 

 npparet , vnde eam 7^^ grad. ftatuo. 



Die 2.6'^ Martii vi magnetica eiusdem acus rur- 

 fus quantum potui auda , obferuaui 



indi- 



