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The master switches were thrown and the pangs of inertialessness again assailed them but weaker far this time than ever before and upon their lookout plates they beheld a spectacle never before seen by eye of man. For the ultra-beam, with its heterodyned vision, is not distorted by any velocity yet attained, as are the ether-borne rays of light.
"Sh-sh," whispered Dorothy, "they'll hear you, Dick we're intruding shamefully." "No, they won't hear us, because I haven't heterodyned the audio in on the wave yet. And as for intruding, that's exactly what we came over here for." He imposed the audio system upon the inconceivably high frequency of their carrier wave and spoke in the Osnomian tongue.
This three-dimensional model, or view, or whatever you want to call it, is converted into electricity in the headsets, and the resulting modulated wave goes back to the educator. There it is heterodyned with another wave this second frequency was found after thousands of trials and is, I believe, the exact frequency existing in the optic nerves themselves and sent to the receiving headset.
While he's talking I've got to have audio waves heterodyned both ways in the circuit, and they'll be able to hear any noise any of us make so all of us except Carfon want to keep absolutely quiet, no matter what happens or what we see. As soon as he's done I'll cut off the audio sending and say something to let you all know we're off the air. Got it?"
Through the narrow slit in the fifth-order screen through which Seaton was operating, in the bare one-thousandth of a second that it was open, so exactly synchronized and timed that the screens did not even glow as it went through the narrow opening, a gigantic beam of heterodyned force struck full upon the bow of the Skylark, near the sharply-pointed prow, and the stubborn metal instantly flared blinding white and exploded outward in puffs of incandescent gas under the awful power of that Titanic thrust.
"His defenses were remarkably good," Alexander said dryly. Well he'd done it now, Kennon thought. He found the thought-screen circlet sandwiched between two books on comparative neuroanatomy which he hadn't bothered to unpack. He slipped it on and connected the lead wires to a portable battery pack. There was a half-forgotten tingling as the weak field heterodyned his thought waves. Kennon sighed.
Sending the heterodyned wave through steel is easy, but breaking it up, so as to view an object and return the impulses, was an awful job and one that isn't half done yet. We see things, after a fashion and at a distance of a few kilometers, by sending an almost parallel wave from a twin-projector to disintegrate and double back the viewing wave.
But how can we see anything there? I always thought that I knew something about rays, but I see that I do not. The light-rays must be released, or deheterodyned, close to the object viewed, with nothing opaque to light intervening. They must then be reflected from the object seen, must be gathered together, again heterodyned upon the fifth-order carrier, and retransmitted back to us.
You folks can see just as well, even on the direct-vision wall plates, with light heterodyned on the fifth, so we'll close all ether bands, absolutely. All we'll have to leave open will be the one extremely narrow band upon which our projector is operating, and I'll protect that with a detector screen.
Rovol moved more controls and the structure again righted itself, swinging back into perfect alignment with the tube and carrying the faidon upon its extremity, a thousand yards beyond the roof of the laboratory. "We are now ready to start our projection. Be sure your suit and goggles are perfectly tight. We must see what we are doing, so the light-rays must be heterodyned upon our carrier wave.
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