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Updated: June 14, 2025
By all means let us have this force when it can be made ready but it would take at least two years to construct, equip, and deliver such a heavy additional naval tonnage, while 200 fighting seaplanes, with a full complement of machine guns, bombs, microphones, and aërial cameras, could be put in active service in the North Sea within six months.
The professor, however, with that foresight which was one of his most remarkable characteristics, had met this difficulty, at the time when the special diving-dresses for the party were in process of manufacture, by the introduction into each helmet of a pair of small but powerful microphones of his own design, with the result that wearers of the dress could hear as distinctly as when they were in the open-air, and could converse together with perfect facility.
Now that the world is disgracefully pacific and you have all heard foreign ministers unanimously declaring their countries neutral so fast did they rush to the microphones that they were still panting when they went on the air when the whole world was cautious, Ireland, true to her traditions, joined the just cause. Gentlemen, I give you our fighting ally, Eire."
Late that evening Prescott joined the two men who were watching DuQuesne's house. They reported that all was perfectly quiet, as usual. The scientist was in his library, the instruments registering only the usual occasional faint sounds of a man absorbed in study. But after an hour of waiting, and while the microphones made a noise as of rustling papers, the needle of the compass moved.
In investigating the properties of metallic conductors employed in the construction of microphones, Mr. Munro's first experiments were made with wires.
This was a very curious situation because no one except Simpson, the airline pilot, and the two harbor patrolmen knew what was taking place. The room had even been thoroughly searched for hidden microphones. That is the way the story stood a few hours after Lieutenant Brown and Captain Davidson arrived in Tacoma.
Presently the investigating spaceboat reached the mystery ship and circled it, beaming queries. No answer. It reported the cargo ship dark. No lights anywhere on or in it. 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.
The idea certainly seemed feasible. Suppose the submarine used a great many "microphones" or receiving transducers to pick up the sonar pulses beamed out by another craft trying to detect it? These impulses could then be passed on and sent out by speakers on the opposite side of the sub, and relayed along on their underwater path of travel.
Bullet projectors and heat ray cylinders. And we had several eavesdropping microphones which we planned to use whenever occasion offered. Only twenty-eight hours of this eventful voyage had passed. The Planetara was some six million miles from the Earth; it blazed behind us, a tremendous giant. The body of Anita was being made ready for burial. George Prince was still in his stateroom.
Along one side of the room was a solid bank of four-foot-square teleceiver screens with an enlisted spaceman or junior officer seated in front of each one. These men, at their microphones, were relaying meteor and weather information to all parts of the solar system. Now it was Roger's turn to get excited at seeing the wonderful radar scanners that swept space for hundreds of thousands of miles.
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