I went even further, then; for at night, when the whistling commenced, I made a microphone test.

The microphone test of the walls would certainly have made this known to me, as I have said; but there was nothing of the sort in the castle; so that I had practically no doubt at all now, but that it was a genuine case of what is popularly termed 'haunting.'

Another extraordinary thing is that the microphone will not magnify the soundwill not even transmit it; seems to take no account of it, and acts as if it were nonexistent.

In certain applications, of course, the receivers may be combined with a microphone; yet on an aerial as well as on a subterranean line the transmitter produces effects which, as regards intensity and clearness, are comparable with those of a pile transmitter.

Theory of the Action of the Carbon Microphone.

They have telephone and microphone on the brain, and such a bawling between the house and the mill you never heard.

pb id='102.png' /> GOODWIN, HAROLD L. A microphone for David, by Hal Goodwin.

FLOHERTY, JOHN J. Behind the microphone.

JOHN J. Inside the F.B.I. SEE FLOHERTY, JOHN J. FLOHERTY, MARGARET P. Behind the microphone.

R117075, 9Sep53, Harris Hawthorne Wilder (A) WILE, ADA S. Emile Berliner, maker of the microphone. R119410.

Emile Berliner, maker of the microphone.

Woman singing at microphone, man at piano.

Microphone memoirs of the horse and buggy days of radio.

Both sides of the microphone, training for the radio.

SEE Gardner, Horace J. Both sides of the microphone, training for the radio.

pb id='102.png' /> GOODWIN, HAROLD L. A microphone for David, by Hal Goodwin.

Not if I die stopping it!" A familiar voice, issuing from the lips of the fauna voice made natural and audible as the living human tones, by means of a delicate microphone attachment inside the bronze headtautened his nerves.

MICROPHONE, an instrument invented in 1878 by Professor Hughes, and consisting of charcoal tempered in mercury, which intensifies and renders audible the faintest possible sound.

Then a special electrical receiver of extreme sensitiveness, known as a microphone, was substituted and connected at the receiving station with an ordinary telephone receiver.

While the sounds of the submarine's machinery are not audible above the water, the delicate microphone located beneath the water can detect them.

Wheatstone also devised an instrument for increasing feeble sound, which he called a microphone.

This consisted of a pair of rods to convey the sound vibrations to the ears, and does not at all resemble the modern electrical microphone.

A microphone transmitter was arranged so that the vibrations of the voice would affect the stream of gas flowing in a sensitive burner.

But when a microphone transmitter is inserted in the sending circuit, instead of the make-and-break key used for telegraphy, the waves of the voice, thrown against the transmitter in speaking, break up the waves so that the telephone receiver in the receiving circuit will reproduce sound.

But the delicate microphone would not carry these stronger currents.