. An elementary manual of radiotelegraphy and radiotelephony for students and operators . Fio. 26. Length in feet of vertical part of Transmitter . 5 4 3 0 1 Length in feet of horizontal part of Transmitter . 15 16 17 18 19 Radiated wave length in feet . . 100 100 105 106 110 Azimuth of horizontal part of Current in the receiving Antenna in Transmitter in angular degrees. arbitrary units. 0 100 100 100 100 100 16 98 97 94 92 93 30 92 85 96 83 75 45 82 79 79 77 67 60 78 74 70 71 68 76 77 67 69 66 46 90 72 66 57 52 48 105 71 G5 57 46 41 lao 70 GO 62 53 49 135 72 64 60 54 48 150 73 80 58 67 59 16
. An elementary manual of radiotelegraphy and radiotelephony for students and operators . Fio. 26. Length in feet of vertical part of Transmitter . 5 4 3 0 1 Length in feet of horizontal part of Transmitter . 15 16 17 18 19 Radiated wave length in feet . . 100 100 105 106 110 Azimuth of horizontal part of Current in the receiving Antenna in Transmitter in angular degrees. arbitrary units. 0 100 100 100 100 100 16 98 97 94 92 93 30 92 85 96 83 75 45 82 79 79 77 67 60 78 74 70 71 68 76 77 67 69 66 46 90 72 66 57 52 48 105 71 G5 57 46 41 lao 70 GO 62 53 49 135 72 64 60 54 48 150 73 80 58 67 59 165 70 74 56 69 60 180 82 69 64 63 68 186 RADIOTELEGRAPHY These observations clearly confirm Marconis observations thatthe radiation from a bent antenna is unsymmetrical, being greatestin a direction opposite to that towards which the free end of theantenna points. It was also found that by bending down the freeend towards the earth, as in Fig. 27, the radiation became stillmore unsymmetrical, as shown by the polar curve in Fig. 27,. in which the radii represent the strength of the currents in thereceiving antenna corresponding to various relative positions ofthe horizontal or inclined part of the transmitting antenna. Itwill be seen from Fig. 27 that the tipping down of the horizontalpart causes nearly the whole of the radiation to be sent outtowards that side opposite to which the free end points. Another entirely different method of giving direction to electricwaves has been devised by F. Braun, which depends upon theinterference of electric waves travelling in the same direction butdifferent in phase. In Brauns method, three simple vertical wireantennae are set up in positions corresponding to the angularpoints of an equilateral triangle, and oscillations are created inthese antennae which differ from one another in phase. Theseoscillations with phase differences were produced by a methoddevised by Papalexi and Mandelstam. By these arrangements it ispossible to cause the wave
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1916
