) 158 ( Sftta 



quod eandem, id eft, negatiuam pofljdeat vim eleclricam. 

 Fingamus ergo, ftratum accumulationis extendi a CDvsque 

 ad /;//;, huicquelaminae CDEF parti CDw« deberi in ftatu na- 

 turali fluidi eledrici quantitatem =XN. Stratum rarcfadtio- 

 nis erit ergo ;//»EF, eique in ftatu naturali competct fluidi 

 elecfrrici quantitas =r. ( i — fc ) N. Sit porro fluidi ele&rici in 

 CD/«« accumulati quantitas ad naturalem, \ti £) : i ; expulfi 

 autem in parte ;;///EF, vti (£ : i ; ita, vt fluidi cle«ftrici in 

 parte CD/«» fit quantitas zr;XN( i -f-JD) ; in parte ;;/ « E F 

 vero zz (i— X)N(i — (£); adeoquc in tota lamina CDEF 

 — N(i-f-X£) — (i — X)(E); fint iam y et x duae particulae 

 fluidi ele&rici, alteraj in fuperficie E F, altera .v in plano mn, 

 intcr ftratum accumulationis et rarefadtionis medio, conftitu- 

 tae; atquc inueftigcmus vircs, et attracliuas et rcpulfiuas, qui- 

 bus hae particulae x et y follicitabuntur ; quem in finem per- 

 pendendum eft, quahs earnndem fuerit conditio in ftatu natu- 

 rali. Ponatur ergo, in ftatu naturali particulam fluidi elciftrici 

 y attrahi a mafla totius aggregati \i rz A ; repelli vero a fluido 

 ele&rico ftrati EF;»# vi — r\ ftrati mnCD \i ~ar\ corpo- 

 ris CD AB vi — br. Similiter particulam x attrahi a.mafia 

 totius aggregafi vi — %\ repelli a fluido ele&rico ftrati ;;/;/EF 

 vi — r\ ftrati m«CD \i~ar\ corporis CDAB vi — (3 r \ 

 atque ob ftatum naturalem, id eft, aequilibrium omnium ha- 

 rum virium habebitur 



A.— r — ar — br—o; ct 9( -f- r — a /• — (3 /• — b ; 

 vbi quidem notari conucnit, effc a <; i et (3 >> b, a vero ftrido 

 ienfu rz: i ; quoniam tamen ifta vis refpondet parti CD mn a 

 parte w/z/EF diftin<ftae, quarum fuas quaclibct independenter 

 ab^ altcra intuitu eledricitatis Yiciflitudines (ubirc poteft, haec 

 littera a in caleulum erit introducenda, quo euoluto ponendum 

 erit a zr i . 



Hisce ex ftatu naturali notatis, perpcndatur, abiiflejam 

 m in SR(i-£); XN in XN (i -f-£>) et (i -X)N in 



(«- 



