INDEX. 



351 



Shunts, use of, with galvanometers and 



ammeters, 49 



Siemens' electrodynamometer, no 

 Silver coulombmeter, the, 21 

 Soddy, Frederick, Radio-activity, 234 

 Solenoid, magnetic field inside of, IO2 

 Sounder, the telegraph, 323 

 Spark at break, 141 



gauge, the, 177 



micrometer, the, 177 



electric, in a gas, 224 



the electric, 164 



Sparking distances in air, table of, 177 

 Specific inductive capacity, see inductivity 

 Standard cell, Clarke, 1 6 



cells, 284 



ohm, the international, 26 

 Step-upand step-down transformation, 134 

 Storage cell, the, 18 

 Strength, dielectric, 174 



of a magnet pole, 63 



of current, magnetically defined, 98 

 Strengths, dielectric, table of, 176 

 Submarine telegraphy, 328 

 "Superior" metal, 28, 30 

 Syphon recorder, the, 330 



Table of dielectric strengths, 176 



of inductivities of various dielectrics, 

 169 



of sparking distances in air, 177 

 Tangent galvanometer, 104 

 Temperature coefficients of resistance, 33 



coefficients of resistance, table of, 28 

 Telegraph, the Morse, 3, 323 



the printing, 327 

 Telegraphy, diplex, 325 



duplex, 326 



quadruples, 326 



submarine, 328 



wireless, 334 

 Telephone, the, 322 

 Terrestrial magnetism, 292 

 Thermo-electricity, 315 

 Thermo-element, 315 

 Thermopile, the, 315 

 Thomson effect, the, 317 



Thomson, J. J., Applications of Dynamics 

 to Physics and Chemistry, 117 



Thomson's, J. J., Conduction of Elec- 

 tricity TJirough Gases, 225 



Toepler-Holtz machine, the, 204 



Transformation, step-up and step-down, 



134 

 Transformer, current and electromotive 



force relations of, 135 

 the alternating-current, 133 

 the alternating current, mechanical 



analogue of, 195 

 Transmitter, the carbon, 333 

 the telephone, 333 



Units, electromagnetic system of, 1 80 

 electrostatic system of, 1 80 



Vacuum tube, the, 226 

 Volt, definition of, 36, 99 



definition of, on the basis of Ohm's 



Law, 38 



Voltaic action and local action, 16 

 cell, the, 12 



cells for closed circuits, 20 

 for open circuits, 20 

 types of, 13 

 Voltage drop, 39, 40 

 Voltameter, the, see the coulombmeter 

 Voltmeters and ammeters, 42 

 Voltmeter multiplying coils, 50 

 the electrostatic, 184 



Water waves in a canal, 257 

 Wattmeter, the, 284 

 Wave distortion, 261, 269 



electromagnetic, velocity of, 267 



the electromagnetic, 262 

 Waves, electric, see electric waves 



in a canal, 257 



Weber's electrodynamometer, no 

 Wehnelt's interrupter, 340 

 Welding, electric, 341 

 Weston cell, the, 284 

 Wheatstone's bridge, 282 

 Wimshurst machine, the, 206 

 Wireless telegraphy, 334 



Zeeman effect, the, 319 



