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"Even with good microphones and amplifiers the engineer in the field may often experience difficulties with the lines connecting the outside point to the studio. The majority of such lines do not transmit the higher frequencies adequately, especially the longer ones. The problems become immense when European simultaneous broadcasts are attempted.
It then transpired that Professor Hughes had previously obtained the same remarkable effects from his ordinary 'pencil' microphones. The sounds were extremely feeble, however, but the transmitting microphones proved the best articulating ones.
It was considerably smaller than the Imperial Palace at Asgard on Odin, but room for room the furnishings were rather more ornate and expensive. By the next afternoon, the counter-espionage team that had gone down reported the Masterly living quarters clear of pickups, microphones, and other apparatus of servile snooping, of which they had found many.
The boring from which this poisonous vapour issued was clearly man-made; moreover I alone knew the formula of that gas and had convinced myself once for all as to its man-made origin. I sent for microphones and with their aid speedily detected the sound of machinery in other workings beneath.
"Make yourselves at home," Estra was saying. He pointed to several microphones within easy reach. "These are provided with my translators, so when you are ready to open up conversation, go right ahead as though you were among your own people." And he made himself comfortable in a saddlelike chair, as much as to say that there was no hurry. For a long time the explorers stood taking it in.
His first microphones were formed of bits of carbon and scraps of metal, mounted on slips of match-boxes by means of sealing-wax; and the resonance pipes on which they were placed to reinforce the effect of minute sounds, were nothing more than children's toy money boxes, price one halfpenny, having one of the ends knocked out.
He offered it. "I'll live there," asked Coburn coldly, "and wait for them to come to me? I'll have microphones all about so that every word that's said will be relayed to your recorders? And there'll be a bomb somewhere about that you can set off by remote control? Is that the idea?" Then Janice spoke up. And Coburn flared into anger against her. But she was firm.
His microphones will tell him, while he is still totally submerged, that his approaching prey is a slow poke and cannot possibly outrun him; then he'll come up, take a look and clinch his conclusions after which he will attack." "True for you sir.
A new appliance I don't know by whom invented is an improved microphone, by which the revolutions of a propeller are not only heard, but the direction also is indicated, while the force of the under-water sound-waves are translated on an indicator in terms of proximity. The great drawback to this is that the submarines are also equipped with microphones of the sort or at least are said to be.
There were no induction-surges from even pulsing, idling engines. Delicately, the messenger-craft maneuvered until it touched the silent vessel. It reported that microphones detected no motion whatever inside. "Let a volunteer go aboard," commanded the chief executive. "Have him report what he finds." A pause. Then the solemn announcement of an intrepid volunteer's name, from far, far away.
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