790 



INDEX. 



Poisson's method, 1144; equation, 31; 

 hypothesis on the constitution of 

 dielectrics, 167 ; theory of magnetism, 

 316; theory, 384, 387. 



Polarity, magnetic, inverse of, 300 ; bis- 



' mirth, 1219. 



Polarization, magnetic rotatory, 591, 

 595. 597; plane of, 643; measure- 

 ment of, 1020. 



Poles, analogous and antilogous, 1075; 

 magnetic, of the earth, 306, 307, 436 ; 

 false, 436. 



Polygons, properties of closed, 437. 



Polynomials, Legendre's, 766. 



Potential, definition of, 22 ; change of, 

 by interposing a dielectric, 122 ; of a 

 magnet, 314, 319; of a lamellar 

 magnet, 335 ; of a solenoidal mag- 

 net, 334; of a current, 446-9; energy 

 of magnets, 338, 354; of currents, 

 570 ; dimensions of magnetic, 609 ; 

 of: a sphere, 355; of an ellipsoid, 

 356 ; of the earth's magnetism, 439 ; 

 of a homogeneous spherical bowl, 

 773; measurement of electrical, 801, 

 1050. 



Potentiometer, Clark's, 1013. 



Power, magnetic, 326 ; of a shell, 329 ; 

 optical of a telescope, 659; multi- 

 plying of a shunt, 867. 



Pressure, electrostatic, 41, 104; influ- 

 ence of on discharge, 823. 



Problem, Barlow's, 389. 



Producer in an electrical machine, 195. 



Projection of images, 874. 



Proof ring, 1211. 



Propagation of heat, want of analogy 

 to that of electricity, 242 ; velocity of, 

 of light, 633. 



Pyroelectrical currents, io8or 



Pyroelectricity, 1075. 



QUADRANT electrometer, 789, 810. 

 Quadrantal deviation, 1233. 

 Quantity, arrangement of batteries for, 

 ; 84, 93 ; measurement of a, of elec- 

 tricity, 1130. 



R 



RAYLEIGH, Lord, calculation of co- 

 efficient of mutual induction, 765. 



Receiver in an electrical machine, 195. 



Recoil, method of, 887. 



Recorder, syphon, 860. 



Rectilinear current, action on a pole, 

 444. 



Reduction of vibrations, 691. 



Refraction of the flow of force, 113. 



Replenishes 195, 809, 817, 1132. 



Residual charge, 824, 1042 ; magnetisa- 

 tion, 406. 



Resistance, 129 ; of a coil, 726 ; the 

 inverse of a velocity, 205, 615; di- 

 mensions of, 607 ; comparison of by 

 currents, 931 ; of a battery, 934, 962 ; 

 construction of standard, 921 ; boxes, 

 926 ; verification of, 974 ; of a gal- 

 vanometer, 934, 961 ; measurement 

 of very small, 977 ; of metals, 998 ; 

 of electrolytes, 1003; apparent, 1280. 



Reverser, current, 973. 



Revolution, systems of, 138. 



Rheostate, 930. 



Riemann's theory, 626. 



Riess' sine electrometer, 799. 



Rigidity, 708 ; of wires allowed for, 

 715; magnetic, 342. 



Ring, guard, 1043. 



Rocking commutator, 1055. \ 



Rotating powers, 1290. 



Rotation, electromagnetic, 455, 483 ; 

 of liquids, 485, 486 ; of a current, 

 490; magnetism of, 573. 



Rotatory magnetic polarization, 591, 



595, 597, 639- 



Rowland's experiment on magnets, 424, 

 617. 



SAUSSURE'S electrometer, 799. 



Scale, correction of a, for temperature, 



656 ; graduation of, 665. 

 Screens, conducting, 563. 

 Secondary currents, 253. 

 Seebeck's discovery, 271. 



