. Some quantitative experiments in long-distance radiotelegraphy . NauticalMiles Ir Kd 10-6 amp. 10- > amp. Obs. Cal. 20 37 6220 5880 50 2486 2160 100 185 1243 941 200 370 622 325 357 300 555 414 165 179 400 740 311 95 102 500 925 249 65 62 600 1110 207 45 800 1480 155 19 1000 1850 124 1 10 1 dKm I, = 33 =1000 185000 10-6 { imp. NauticalMiles I R K d 10-6 amp. 10-6. amp. Obs. Cal. 20 37 5000 4730 50 2000 1740 100 185 1000 757 200 370 500 260 287 300 555 ZZ3 130 144 400 740 250 75 500 925 200 50 600 1110 167 35 800 1480 125 16 1000 1850
. Some quantitative experiments in long-distance radiotelegraphy . NauticalMiles Ir Kd 10-6 amp. 10- > amp. Obs. Cal. 20 37 6220 5880 50 2486 2160 100 185 1243 941 200 370 622 325 357 300 555 414 165 179 400 740 311 95 102 500 925 249 65 62 600 1110 207 45 800 1480 155 19 1000 1850 124 1 10 1 dKm I, = 33 =1000 185000 10-6 { imp. NauticalMiles I R K d 10-6 amp. 10-6. amp. Obs. Cal. 20 37 5000 4730 50 2000 1740 100 185 1000 757 200 370 500 260 287 300 555 ZZ3 130 144 400 740 250 75 500 925 200 50 600 1110 167 35 800 1480 125 16 1000 1850 100 10 Austin] Experiments in Long-Distance Radiotelegraphy 329 The curves of figures 3 to 10 give the results in graphic dotted Une gives the strength of signal which would have beenreceived if the K/d law had obtained; that is, if there had been noabsorption. The continuous curve gives the theoretical day valuesas calculated from equation 2, while the individual observations 10~« AMP. 700 BIRMINGHAM RECEIVED AT BRANT ROCK, JULY, 1910 600 500 400. 100 200 300 400 500 600 700 80Q 900 1000 MILESFig. 3 are represented by crosses. Observations taken by the deflectionmethod are indicated by circles around the crosses, while nightobservations are accompanied by the letter N. It is seen that theday observations correspond approximately to the values of thecalculated cinve, but that the night signals are entirely irregular, 330 Bulletin of the Bureau of Standards [ No. 3 being in general stronger than the day signals, as was first observedby Marconi. Sometimes they lie close to the K/d curve, indicatingthat the absorption has disappeared, while at others they arepractically of the same strength as the day readings. In a veryfew cases, night signals were observed considerably stronger thanthe calculated value for zero absorption, but these may very Ir 10-6AMP. 700 600 500 400 300 200 100 BIRMINGHAM RECEIVED AT BRANT ROCK, JULY, 1910
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