INDEX 



799 



Dispersion, glass, 509 



Displacement constant (Wien), 80 



Displacement law (Wien), 79, 80 



Dominical letter, 732 



Dowmetal, 220 



Duralumin, 220 



Dusts (see under Colloids) 



Dyestuffs, transmission of radiation, 538 



Dyne, 5 



Ear (see also under Sound), 306, 314 

 Earth (see also under Astronomy), 728 

 age, 741 



angular velocity, 780 

 area, 729, 772 



land, 772 



oceans and seas, 772 

 atmosphere (see also Atmosphere), 592 

 characteristics, 734, 739 

 composition, 625 

 constants, various, 729, 772 

 craters, 736 

 density, 48, 739 



vs. depth, 739 

 depth, oceans, 773 

 dimensions, 729, 772, 773, 774 

 distance to moon, 729, 730 

 distance to sun, 729, 730 

 earthquake waves, velocity, 740 

 electrical data, 502 

 elements, percent, 625 

 elevation, mountains, 772 

 energy, rotational, 729 

 gravitation (see also Gravitation), 714 

 interior characteristics: density, 739 



elastic constants, 739 



pressure, 739 

 land area, 772 

 liquefaction, 740 

 magnetic data, 502 



magnetism (see also under Geomagnet- 

 ism), 470 

 mass, 729 



moment of inertia, 739 

 oceans and seas, 772 

 orbit, 729 



dimensions, 729, 774 



eccentricity, 729 



general precession, 729 



obliquity, 734 

 physical data, 729, 734 

 radius, 729, 734, 772 



equatorial, 729, 734 



polar, 729, 734 

 rigidity, 740 

 rotational energy, 729 

 solidification, 741 

 temperature: depth, 726, 727 



oceans, 774 



surface, 726 

 highest, 726 

 lowest, 726 

 selected stations, 726 

 variation, 726 

 velocity: in orbit, 729 



rotation, 729 

 volume, 729 



Earthquake waves (see also under Astron- 

 omy), 740 

 Effective wavelength, red pyrometer glass, 



537 

 Efficiency, lamps, 105, 110 

 Elastic limit, 187 

 Electric arcs, 105, 109 

 capacity, 16 

 current, 11 



effect on human body, 375 

 dipole moment, 441 

 field intensity, 11, 12 

 inductance, 17 

 potential, 11, 12, 20 



difference, 11 

 power, 17 

 quantity, 13 

 standards, 13, 19 

 surface density, 11 

 units, 10, 15, 16 

 definitions, 10-20 

 1948, 19 



relative values, three systems, 20 

 Electrical capacity, 16 



characteristics of materials, 375, 380 

 conductivity, 12 

 alloys, 390 

 metals, 390 

 conversion factors, 18, 20 

 definitions, 10-20 

 effect on human body, 375 

 equivalents, former, 22 

 fundamental standards, 13, 19 

 inductance, 17 



properties of insulating materials, 429 

 resistivity, metals, 393 

 sheets, magnetic properties, 456, 459 

 standards, 10, 20 

 steel sheets, core losses, 456 

 units: ampere turn, 18 

 basis of each, 16 

 capacity, 16 

 conversion factors, 20 

 electromagnetic, 10, 20 

 electrostatic, 10, 20 

 unit quantity, 10 

 former, 22 



international prior to 1948, 16, 19 

 new (1948), 19 

 absolute, 19 

 how maintained, 19 

 relation to electromagnetic, 20 

 relation to electrostatic, 20 

 relation to international (prior to 

 1908), 20 

 old, 22 

 practical, 20 



relation of three systems, 20 

 Electricity: 



atmospheric, 614 

 constants, 615 

 charge on rain, 615 

 charge on snow, 615 

 elements, 615 

 ionic equilibrium, 615 

 lightning, 614 

 piezo, 432 



