Contents xxiii 



M. [MEASURES] .... P . 289 

 From MS. No. 20 



ARTICLES 



Comparison of charges of jars and battery, method of repeated communication . . 581 



Theory pf this method 582 



Results 583 



Charge of ist battery of Nairne .......... 584 



Whether shock is diminished by imperfect conduction of the salt water in the jars . 585 



Specific gravity of solutions of salt 586 



Rule for finding the quantity of salt in water from its specific gravity . . . 586 



Measurement of Lane's second and third electrometers 587 



Conductivity of salted wood ........... 588 



Dimensions of coatings of glass plates ......... 589 



Rules for making trial plates ........... 589 



Specifications for coating of plates .......... 589 



Measures of thickness of 2nd rosin plate ......... 590 



Measures of thickness of crown glass . . . . . . . . .591 



From MS. No. 13 



List of plates of glass . . . . . . . . . . . 592 



Twelve plates from Nairne ........... 593 



Green glass cylinders ............ 594 



Coatings of jars and cylinders 595 



EXPERIMENTS WITH THE ARTIFICIAL TORPEDO P . 301 



From MS. No. 20 



Shocks from ist Torpedo 596 



Theory of divided circuits ............ 597 



Shock under water 598 



First leather Torpedo ............ 599 



Second leather Torpedo, Tuesday, April 4 [1775] 600 



Second leather Torpedo, Saturday, May 27 [1775] 601 



Mr Ronayne, Mr Hunter, Dr Priestley, Mr Lane, Mr N[airne?]. 



Same day old Torpedo through bright and dirty links ...... 602 



Tried with Lane's electrometer ........... 603 



Tuesday, May 30 [1775]. Distance of discharge of Lane the same for great or small 



number of jars ............. 604 



Charge required to force electricity through chain ....... 605 



Wednesday, May 3 1 [1775]. Comparison of rows of battery 606 



Results of experiments, May 30 607 



Tuesday, June 6 [1775]. Torpedos in wet sand ....... 608 



Shock through salted wood 609 



Monday, June 12 [1775]. Relation between quantity of electricity and number of jars 



that the intensity of the shock may be the same 610 



Second leather Torpedo under water 611 



Tuesday, July 4 [1775]. Second leather Torpedo touched in various ways . . 612 



Experiments without any Torpedo .......... 613 



Anatomy of electric organs of Torpedo 614 



Second leather Torpedo new covered . . . . . . . . .615 



