Man's physical universe

xanabras

INDEX 823

Hardening, 637

Hardness, 188, 237

permanent, 758

temporary, 758

Heat, 226-231

from electricity, 521-526

from high frequency currents, 525-526

generation of, 292-293

measurement of, 293

of fusion, 220, 222-223

of vaporization, 229

rays, 392-396

transfer

by conduction, 282-283

by convection, 283-284

by radiation, 284-285

vibrator^' motion, 385

Heaviside layer, 536

Heavy chemicals, 660

Heavy water, 573

Helicopter, 357

Helium, 662

Helmholtz, Hermann, 89

Hercules star cluster, 74

Herschel, Sir John, 82

Sir William, 108

Hertz, Heinrich, 528, 539, 546

High compression engine, 381

High frequency currents, 525, 526

Highs, 266-269

Highways

expansion of, 342-344

Hogbacks, 151

Hormones, 657, 744-746

Horoscopes, 54

Horse latitude, 251

Horsepower, 289

Hues, 416

Humidity control, 277-278

Hurricanes, 260-261

Hycar, 713

Hydraulic press, 216

Hydrocarbons, 610

chain, 611-617

cracking, 612-613

hydrogenation of, 612-614

polymerization of, 613

ring (cyclic), 617-619

saturated, 612

unsaturated, 612-614, 617-618

Hydrogenation, 613-614, 693-694, 723

Hydrolysis, 607-609, 613

Hydrometer, 217, 594

Hydronium ions, 588, 597, 637-638, 601-

602, 605-609

Hydroponics, 730, 733

Hydrosphere, 125, 132, 135

Hygrodeik, 256

Hygrometer, 256

Hypnotics, 781-784

Hypochlorites, 765

Hypothesis, 21, 23, 24

Lemaitre's, 130-131

nebular, 127

planetesimal, 128

latrochemists, 556

Ice storms, 261

Iconoscope, 541

Igneous rock, 178-181

Illumination, 442-447

Incandescence, 398

Incandescent lamps, 522-524

Incendiaries, 648

Incendiary leaflets, 645

Index of refraction, 217-218

Indicators, 607-608

Indirect lighting, 445

Induction coils, 510-512

Inductive method of reasoning, 21, 56

Infrared

lamps, 393-394

photography, 393-394

rays, 392-396

spectrometer, 395

telescope, 393

Insecticides, 753-754

Insects, 750-755

repellents, 754

Insulation, 282-285

Insulator, 487-488

Intensity

of colors, 416

of polarized light, 428

of sound waves, 460-462

Interference and colors, 416-417

Interferometer, 72

I nternal combustion engines, 326, 328-340

airplane, 358-360

International candle, 442

Interstate Oil Compact, 300-301

Interval in music, 467

Intrusion, 159

Inventions, 320

Invisible glass, 434-435

Iodine, 736, 765, 770

Iodoform, 771

Ions, 581, 589

Irium, 760

Irradiation, 742

1 rregularities of solutions of electrovalent

compounds, 586-587

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