Compound dielectrics 269 



Fr. Mar. 19. [20 obs. Arts. 649, 651.] 

 Tu. Mar. 23. [21 obs. Art. 649.] 

 Wed. Mar. 24. [22 obs. Art. 649.] 



555] Sun. Mar. 2i at [1773]. Th. about 55. N. about 15. 



It was tried whether the 4 rosin plates contained the same quantity of 

 electricity whether they were placed close together or at a distance, and what 

 is to be allowed for the connecting wires, &c. 



This was tried with the usual machine*, the rosin plates being placed on 

 the positive side and sliding plate 3 on the negative side, the sliding plate re- 

 maining always at the same division, the small variations of the charge being 

 found by the additional wire. 



They were tried in 5 different ways. 



I st way. The plates placed close together near the end m, the usual wires V 

 resting on the plates, with the connecting wires put on the plates. 



2 nd way. D without the connecting wires. 



3 rd way. The connecting wires suffered to remain, and also one of the 

 wires V, but the 3 others removed towards end M , placed at 4 inches distance 

 from each other, and supported in their usual situation by silk strings. 



4 th way. The same, except that the 3 wires V were taken quite away. 



5 th way. The rosin plates placed at as great a distance from each other as 

 possible id est f inches with the usual wires V, but without the connecting 

 wires. 



3 rd way, with connect, 

 wires, usual ones re- 

 moved to end 



4 th way, without usual 

 wires 



I st way, with connect- 

 ing wires and usual 

 also 



2 ni1 way, without con- 

 necting wire 



5 th way, removed to 

 distance 



556] Whether charge of white glass thermometer tube is the same when hot as 

 when cold\. 



Sun. Mar. 21 [1773] afternoon. Th. about 55. N. about 15. 

 A ball about I inch in diameter was blown at the end of a thermometer 

 tube with a bulb 4-3 inches above. This was filled with sufficient to rise into 



* [Art. 295. See Art. 337.] f [So in MS.] J [See Art. 366 and Note 26.] 



