Contents xiii 



ARTICLES 



Lemma xiii. Repulsion of two columns !^6 



Lemma xiv r ^7 



Lemma xv (Fig. 3). Action of a uniform cylinder on an external point . . . 148 

 Cor. Potential of middle and end .......... 149 



Prop, xxxi (Fig. 3). Charge of cylinder compared with that of globe .... 150 



Cor. Upper and lower limits of charge . . . . . . . . .151 



Prop, xxxn (Fig. 4). Charge of two equal cylinders at a finite distance . . . 152 

 Prop, xxxin. Ratio of charges of B and b may be deduced from the ratios of Band b to C 153 

 Lemma xv (Fig. 5). Repulsion on a short column close to an electrified plate . . 154 



Lemma xvi (Fig. 6). Two equidistant concave plates 155 



Cor. i. Definition of corresponding points, &c. ....... 156 



Cor. 2. Density increasing towards the circumference . . . . . .157 



Lemma xvn (Fig. 7). Concave plate compared with flat one 158 



Cor 159 



Prop, xxxiv (Fig. 8). Theory of a coated plate 160 



Cor. i. Flat coated plate of any form 161 



Cor. 2. Flat circular plate . . . . . . ... . . . 162 



Cor. 3. Plate not flat but of uniform thickness . . . . . . . .163 



Cor. 4. Density increasing towards the circumference . . . . . .164 



Cor. 5. General conclusion . . . . . . , . . . .165 



Cor. 6. Comparison with globe 166 



Cor. 7. Form of plate indifferent 167 



Cor. 8. Charge directly as surface and inversely as thickness 168 



Prop, xxxv (Fig. 9). Theory of conducting strata in the glass plate .... 169 



Prop, xxxvi (Fig. 10). Penetration of glass by fluid 170 



Cor. i. Equivalent thickness of plate if there were no penetration .... 171 



Cor. 2. Thickness of coatings indifferent ......... 172 



Prop, xxxvii. Density more nearly uniform than if there had been no penetration . 173 

 Cor. Distribution probably nearly the same as in plate of air of equivalent thickness 174 



APPENDIX p. 102 



From MS. No. 5 



Prop. i. Charge of a condenser little affected by the presence of an overcharged body 175 



Cor 176 



Prop. II 177 



Part i. A stricter demonstration, applicable to case of penetration . . . .178 



Part II 179 



Cor. i 180 



Cor. 2 181 



Cor. 3 182 



Cor. 4. Effect of an overcharged body 183 



Cor. 5 184 



Cor. 6 (Fig. 1 1). Two coated plates in communication little affected by an overcharged 



body 185 



Cor. 7. Canals may be curved as well as straight . . . . . . .186 



Lemma. Potential of two equal particles compared with that of their sum at their centre 



of mass .............. 1 87 



Applied to case of two parallel disks 188 



Mutual action of large circle and trial plate in Experiment v ..... 189 



Mutual action of small circles and trial plate in Experiment v 190 



[General negative conclusion] . . . . . . . . . . .192 



Effect of floor and walls of the room .......... 193 



Effect of earth connexion the same as if it were infinitely long ..... 194 



b 



