. Official proceedings . ritical pressure,these nadal points are indicated by the glowing tube. In placeof a tube a small incandescent lamp can also be used. It willbe seen that these points are about a meter apart, as this repre-sents a half wave length, the frequency is readily determinedto be about 150,000,000 cycles per second. That seems likea tremendously rapid change in direction of the current backand forth every second when compared with the ordinary houselighting current frequency of 60 per second. 108 But when compared to the frequency of light waves it is very slow, for yellow ligh
. Official proceedings . ritical pressure,these nadal points are indicated by the glowing tube. In placeof a tube a small incandescent lamp can also be used. It willbe seen that these points are about a meter apart, as this repre-sents a half wave length, the frequency is readily determinedto be about 150,000,000 cycles per second. That seems likea tremendously rapid change in direction of the current backand forth every second when compared with the ordinary houselighting current frequency of 60 per second. 108 But when compared to the frequency of light waves it is very slow, for yellow light has a frequency approximately 4million times as great. There does not seem to be much hopethen of getting- frequencies directly by this means for light pro-duction. The tube acts as a generator of oscillation because itspower circuit and its control circuit are so related as to effectan energy transfer from one of the other at certain times. Thiscondition is controlled by the values of the constants of the Exponential horn invented by C. R. Hanna and J. R. Slepcan, Research Engineers. These same factors also determine the frequency of theoscillations. It is interesting to note that there is a certain amount ofspace radiation taking place as can be seen by exploring with asimple straight wire with a miniature lamp inserted in the mid-dle to indicate, by its filament lighting, when current is passing. High frequency currents of a considerable lower order offrequency, however, are being used successfully for telephoningover high tension power lines while the lines are operating nor-mally in transmitting power at very high voltages. 109 They are also used on the trunk lines of the telephone com-panys service to increase the carrying capacity of existing linesfor long distance communications. Thus one pair of wires maycarry half a dozen different conversations simultaneously with-out the slightest trace of confusion. Auditorium Loud Speaker As an amplifier the vacuum
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