244 "Journal of Experiments, Oct. 17, 1772 



N. 8 in soft cem. same as N. I. 



N. 2 not covered, closed rather sooner and sep. rather more than N. i. 



E. 3 closed in about 5", did not sep. in \ min. 



500] Trials of quant, el. in Leyden vials, &c. 

 The following plates were coated as follows*. 



Two trial plates were made with two plates of glass with rosin between, 

 for comparing thick rosin with the double plates A and B. 



Two trial plates were also made on a piece of the white plate glass for com- 

 paring N and thin white with D + E. 



* [See Arts. 370, 371.] 



