None
190 adjustment of, for damped wave signals 350, 882 for damped wave signals 340 station, essential elements of a 189, 336 Reception of undamped waves by means of oscillating tubes 483, 514 Rectification by three-elecrfrode tube without grid condenser, as shown by oscillo- grams 445 Rectifying detectors, action of 338 Resistance 14, 21, 111 and reactance of the primary of an inductively-coupled circuit as affected by secondary 93 effective 40 high frequency, general concept of Ill laboratory measurement of 906 of antenna 746 coils, effect of neighboring circuits on 133 932 INDEX frAOK Resistance of iron-core coils 134 spark and arc 136 the circuits of a three-electrode tube and its variation 421 Resonance 60 curves for coupled circuits 99 form of 101 curve of an oscillatory circuit excited by damped sine waves 272 in a circuit to which another is magnetically coupled 85 simple series circuit, laboratory investigation of 880 circuits with capacitive coupling 105 series, with varying capacity 62 transformer, definition of 296 Resonant adjustment of the audio circuit of a spark transmitter 295 circuit, effect of periodic disturbances in a 257 frequencies in coupled circuits 94 frequency of parallel circuits 78 multiple circuit 73 curves of reactances and resistance for 76 Richardson's formula for electron emission 365 S Saturation current 367, 373 Selectivity, general discussion of 191 Self -heterodyne method of reception of continuous- wave signals 635 Self-induction, coefficient of 25 of a coil as affected by presence of a short-circuited neighboring coil 28 Short-wave condenser, function of 278 Shunting condenser used with induction coil, action of 283 Signal, day and night variation in strength of 197 seasonal variation in strength of 198 selection of 350 Signaling with high frequency, continuous- wave generators, methods of 620 Simultaneous radiophone transmission and reception 686 sending and receiving, essential elements required for 192 Skid-fin antenna for aeroplanes 724 Skin effect, analysis of 117 discussion of. , 113 elimination of 122 in coils 125 Space charge in vacuum tubes 376, 380 Spark gap, care of Chaffee type .317 classification of, for spark transmitter 309 non-synchronous type 313 open type, operating conditions of 309 quenched 247-314 synchronous rotating type, description and operation of 311 resistance of 136 telegraphy, definition of 187 transmitter, adjustment of : 328 INDEX PAGE Spark transmitter, capacity and inductance required in closed and open circuits 334 description of 275 experimental investigation of 887 Specific inductive capacity, table of values 167 Static 193 Steady state in an antenna, setting up of 776 Stone, J. S., equation for spark-gap resistance 219 Strays, classification of. " 193 elimination of 194 T "T" antenna 713, 716, 725 Time constant of an inductive circuit 33 a condenser circuit 38 Telephone receivers, construction and action of 340 impedance of 839 Telephony, radio multiplex 680 current in transmitting antenna 648 receiver 652 receiving antenna 650 field of use 646 principle of operation of transmitter 647 receiver 649 power required to cover distances 683 receiving system for 673 sources of power for 654 transmission of speech 651 Temp rature, max m m safe, for tungsten filaments 371 Transformer, "open core," description of 296 power for spark transmitter 292 Transformers, construction of, for low-frequency amplifiers 839 Transmission, distance of radio signal 357 formulae, limitations of 744 Transient conditions in a circuit consisting of L, R and C in series, analysis of .... 252 current in an inductive circuit 49 a circuit consisting of resistance and a condenser in series .... 58 on switching a resistance circuit to an A.C. line 45 phenomena in audio circuit of spark transmitter, analysis of 304 Transmitter for radio-telephony, best resistance for 660 Transmitters for radio-telephony 654 Tree as receiving antenna 730 Tube, three-electrode 381 as detector of damped waves 440 a source of alternating current 467 power converter, detailed study of, when self-excited. 561 separately ex- cited 539 characteristics of, with positive common junction and with negative common junction 459 two-electrode as voltage regulator for a variable speed generator 373 characteristic curves of 373 934 INDEX PAGE Tube, vacuum, two-electrode 371 Tubes, limits of operation of 389 three-electrode, characteristic curves of 401 for high power telephone sets 669 in radio-telephony 662 fields of , use of 387 hydraulic model of 385 potential distribution in .- 382 relations between currents and potentials in 415 resistance of circuits of, and its variation 421 various types of 388 with small amount of gas, characteristic curves of 397 vacuum, special forms of 534 " Tungar " rectifier 1 372 U Umbrella antenna : 713 Unequal currents in the filament of a vacuum tube 379, 403 Unilateral connection of wavemeter 786 Unipotentia emitting surface for a vacuum tube 379 Units of electrical quantities 20 V Vacuum tube, experimental determination of amplifying factor and internal plate circuit resistance 898 investigation of characteristic curves of 894 study of its characteristics when used as a detector of damped waves 895 generator, measurement of power output of 900 transmitting sets, arrangement of apparatus in 645 use as a detector 350 Voltage amplification factor of a three-electrode tube 384, 417 determination of 417 W Wattmeter 49 Wave-length 183 natural, of antenna 751 of electro-magnetic radiations 213 Wave-lengths, range of, for radio communication 187 used in spark telegraphy 356 Wave-meter, autodyne type .795 devices and schemes for indicating resonance 783 condenser, special form of 792 crystal detector and phones 785 hot-wire ammeter 784 incandescent lamp 791 neon tube 790 crystal detector and galvanometer 790 thermo-couple and galvanometer 788 INDEX 935 PAGE Wave-meter, experiment on uses of the 884 how to improvise a 821 principle and construction of 781 use of, to determine decrement 801 mutual inductance and coefficient of coupling. 819 measure antenna constants 815 inductance and capacity 814 wave-length and energy distribution curves. 796-798 Wave motion, discussion of 179 propagation, equation for 183 velocity of 184 Waves, attentuation of 196 damped 186 electromagnetic, discussion of. 181, 702 transmission of, in water 728 number of-, in a tra'n, formula for 220 stationary, on antenna 756 undamped 186 various types of, used in radio communication 185 water 179 Wave-shape of alternating currents 16 Wave-trains.. 