A Treatise on Electricity and Magnetism, Vol. 2 (1873) — part 27 of 27

— of magnetic molecules, 430, 832-845.

— of molecular currents, 833.

— of molecular vortices, 822.

— of action at a distance, 105, 641-646, 846-866.

Thermo-electric currents, 249-254. Thickness of galvanometer wire, 716,

Thomson, Sir William,

— electric images, 43, 121, 155-181, 173.

— experiments, 51, 57, 248, 369, 772.

— instruments, 127, 201, 210, 211, 216- 222, 272, 722, 724.

— magnetism, 318, 398, 400, 407-416, 428.

— resistance, 338, 351, 356, 763.

— thermo-electricity, 207, 242, 249, 252, 253.

— theorems, 98, 138, 263, 299, 304, 652.

— theory of electricity, 27, 37, 543, 831, 856.

— vortex motion, 20, 100, 487, 702.

Thomson and Tait's Natural Philoso phy, 132, 141, 144, 162, 303, 553, 676.

Time, periodic of vibration, 456, 738. Time-integral, 541, 558. Torricelli, Evangelista, 866. Torsion-balance, 38, 215, 373, 726.

Transient currents, 232, 530, 536,* 537, 582, 748, 758, 760, 771, 776.

Units of physical quantities, 2.

— three fundamental, 3.

— derived, 6.

— electrostatic, 41, 625.

— magnetic, 374, 625.

— electrodynamic, 526.

— electromagnetic, 526, 620.

— classification of, 620-629.

— practical, 629.

— of resistance, 758-767.

— ratios of the two systems, 768-780.

Variation of magnetic elements, 472.

Varley, C. F., 210, 271, 332, 369.

Vector, 1 0.

Vector-potential, 405, 422, 590, 617, 657.

Velocity represented by the unit of re sistance, 338, 628, 758.

by the ratio of electric units, 768-

— of electromagnetic disturbance, 784.

— of light, 787.

— of the electric current, 569. Verdet, M. E., 809, 830. Vibration, time of, 456, 738. Volt, 629.

Volta, A., 246.

Voltameter, 237.

Vortices, molecular, 822-831.

Water, resistance of, 365. Wave-propagation, 784, 785. Weber, W., 231, 338, 346.

— electrodynamometer, 725.

— induced magnetism, 442-448, 838.

— unit of resistance, 760-762.

— ratio of electric units, 227, 771.

— electrodynamic formula, 846-861. Wertheim, W., 447. Wheatstone's Bridge, 347-

— electrostatic, 353, 756, 775, 778. Whewell, W., 237. Wiedemann, G., 236, 370, 446, 447. Wind, electric, 55.

Wippe, 775. Work, 6.

Zero reading, 735. Zonal harmonic, 132.

FILA1TE g

VOL. II .

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