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| xx | CONTENTS. |
| Art. | Page |
|---|---|
| 760. Weber's method by transient currents | 360 |
| 761. His method of observation | 361 |
| 762. Weber's method by damping | 361 |
| 763. Thomson's method by a revolving coil | 364 |
| 764. Mathematical theory of the revolving coil | 364 |
| 765. Calculation of the resistance | 365 |
| 766. Corrections | 366 |
| 767. Joule's calorimetric method | 367 |
Chapter XIX.
Comparison of Electrostatic with Electromagnetic Units.
| 768. Nature and importance of the investigation | 368 |
| 769. The ratio of the units is a velocity | 369 |
| 770. Current by convection | 370 |
| 771. Weber and Kohlrausch's method | 370 |
| 772. Thomson's method by separate electrometer and electrodynamometer | 372 |
| 773. Maxwell's method by combined electrometer and electrodynamometer | 372 |
| 774. Electromagnetic measurement of the capacity of a condenser. Jenkin's method | 373 |
| 775. Method by an intermittent current | 374 |
| 776. Condenser and Wippe as an arm of Wheatstone's bridge | 375 |
| 777. Correction when the action is too rapid | 376 |
| 778. Capacity of a condenser compared with the self-induction of a coil | 377 |
| 779. Coil and condenser combined | 379 |
| 780. Electrostatic measure of resistance compared with its electromagnetic measure | 382 |
Chapter XX.
Electromagnetic Theory of Light.
| 781. Comparison of the properties of the electromagnetic medium with those of the medium in the undulatory theory of light 383 | |
| 782. Energy of light during its propagation | 384 |
| 783. Equation of propagation of an electromagnetic disturbance | 384 |
| 784. Solution when the medium is a non-conductor | 386 |
| 785. Characteristics of wave-propagation | 386 |
| 786. Velocity of propagation of electromagnetic disturbances | 387 |
| 787. Comparison of this velocity with that of light | 387 |
