Xvill CONTENTS. 



ELECTROLYSIS 



416. Electrochemical equivalents 345 



417. Conductivity of a few dilute solutions 346 



418. Electrochemical equivalents and densities of nearly normal solutions 346 



419. Specific molecular conductivity of solutions 347 



420. " " limiting values .... 348 



421. " " temperature coefficient . 348 



422. Equivalent conductivity of salts, acids, bases in solution 349 



423. " " some additional salts in solution .... 351 



424. conductance of separate ions 352 



425. Hydrolysis of ammonium acetate and ionization of water 352 



DIELECTRIC STRENGTH 



426. Steady potential for spark in air, ball electrodes 353 



427. Alternating potential for spark in air, ball electrodes 353 



428. Steady and alternating potential for longer sparks in air 354 



429. Effect of pressure of the gas on the dielectric strength 354 



430. Dielectric strength of various materials 355 



431. Potential in volts for spark in kerosene 355 



DIELECTRIC CONSTANTS 



432. Specific inductive capacity of gases, atmospheric pressure 356 



433. Variation of dielectric constant with the temperature (gases) .... 356 



434. " " " " pressure (gases) . 357 



435. Dielectric constant of liquids 357 



436. " liquids, temperature coefficients 359 



437. " liquefied gases . . 359 



438. " standard solutions for calibration 360 



439. " " " solids 360 



440. " " crystals 361 



WIRELESS TELEGRAPHY 



441. Wave-lengths, frequencies and oscillation constants 362 



442. Antennae resistances for various wave-lengths and heights 364 



443. Dielectric properties of non-conductors 364 



MAGNETIC PROPERTIES 



444. Definitions and general discussion 365 



445. Composition and magnetic properties of iron and steel (old data) . 367 



446. Magnetic properties of iron and steel 368 



447. Cast iron in intense fields 368 



448. Corrections for ring specimens 368 



