xvi Contents 



ARTICLES 



Comparison of square plate with disk 



Oblong plate ... 284 



Cylinder ... 285 



Comparison of different cylinders 



Disturbing cause 2 ^7 



Eighth experiment. Comparison of the charge of the middle plate of three parallel 

 plates with that of the outer ones. (Fig. 19) 



Comparison with theory 2 ^9 



Distribution on the middle plate ........- 2 9 



GENERAL CONCLUSIONS 



First experiment 2 9' 



Second experiment .......- 2 9 2 



Fourth experiment ........ 2 93 



Remaining experiments 2 94 



(3) COMPARISON OF THE CHARGES OF COATED PLATES 



From MS. No. 10 (apparently prepared for publication) 



New apparatus for the comparison of capacities (Fig. 20) 295 



Method of making the experiment 2 9& 



The trial plate 2 97 



Second method 2 9 



Advantage of the second method 2 99 



Spreading of electricity on the surface of the glass. (Fig. 21) 3 



Difference between different kinds of glass in this respect . . . . 3' 



Determination of the velocity of spreading ..... 3 2 



Attempt to check the spreading of electricity by means of cement. (Fig. 22) . . 303 



Results with cement and varnish 34 



These methods abandoned 3S 



Earth-connexion 3 



Instantaneous spreading of electricity on the surface ; electric light around the edge . 307 



Fringe of dirt 38 



Extent of this spreading 39 



Spreading greatest at first time of charging .310 



Recapitulation of the theory of coated plates 3 11 



Correction of the area for spreading of electricity ... 3 > 2 



Computed charge of cylindric vials 3 '3 



Experiments on 10 pieces of glass from the same piece . . . . 3'4 



Table of their dimensions 3'5 



Adjustment of size of coatings 3'6 



Comparison of D +E + F when close together and when six inches apart . . . 3 '7 



Comparison of the plates with each other . . . . . 3 ' 8 



Discrepancy probably due to spreading . . . . . 3'9 



Experimental investigation of spreading 3 2 



Slit coatings. (Fig. 23, Fig. 24) 32' 



Effect of thickness of glass 3 22 



Spreading = 0-07 on thick plates and 0-09 on thin plates 3 2 3 



Table of plates with circular coatings ....... 3 2 4 



Table of the same plates with other coatings . . . . . . 3 2 5 



Verification of the theory of spreading 3 2 



Effect of thickness of glass 3 2 7 



Spreading not uniform throughout its extent . . . . . . 3 2 & 



Effect of different strengths of electrification . . . . . . 3 2 9 



Comparison of crown glass with Nairne's plates 33 



Effect of accumulation near the edge insensible . . . . . . . -33' 



