ventors, the wireless or radio telephone appeared to be an accomplished fact. But they didn't dream how m

ial method of conversation. So far, they had not the least understanding, beyond a general idea, of how the thing w

, boys?" asked Mr. Chadwick whe

thing I could have ima

ll it work?

conductivity than any attainable to get real results. The carbon that I am using does not throw

Tom looke

tand me I see," s

I don't," said J

technical,"

phony," said Mr. Chadwick. "In the first place you know, of course, from your wireless studies,

nto the air spreads out in all directions just like the

transmitter. According to the vibrations of the voice of the person sending the spoken message, the electric current along the wire, acted upon by the microphone in the transmitter,

crophone or transmitter gets busy and records it in electrical impulses and shoots it all along th

se oral cavity it is held. In this way the sensation of the same sound as was spoken at the transmitter end is reproduced at the receiver end. In other words, the transmitter jerks and jumps just as the needle of a phonograph does in traveling over

ire telephony. That is to say, we are required to cause a distant metal disc to repeat every inflection of the transmitter. But in t

hat are employed in wirel

e have not only to transmit sound, such as isolated dots and dashes, but to send through the air every rise a

nderstand, a speech, depends upon overtones and upper

ean by frequen

econd is a low frequency current, 100,000 per second is spoken of as high frequency. In early experiments with radio telephony it was found that the chief difficulty

is attached to that gasoline motor. There is a simil

ire a stronger current than wirele

Chadwick. "Only the variations in the waves can be detected, or transformed into sound at the receiving end of a radio telephone system. Therefore an

actured by a high frequency alternator can be t

enormous. In wireless telegraphy, on the other hand, the entire energy radiated from a

ich this difficulty could

ught, "and I believe that I am the only man in the world

u use it, the

which, if it could be applied to purposes of transmission and detection, has such immense powers of electrical ab

ou send them n

hink so. I'm not even sure of t

patient to get

stioned, "if it would practically wipe ou

than radium. It is the most intensely radio-active stuff in the world. It is capable of being wrought into metal if anybody had ever

xious, though, to test out my present apparatus thorou

way?" a

ascertain over how great a space

another station outside

o my experiments. You boys have a wirele

s Tom, to know the Professor's pla

y I can gauge the limits of my invention without attracting undue attention, as everybody in this vi

paratus light enough for u

" said Mr. Chadwick. "I'll

dy for you,"