“Your 3-D television sure wowed the girls,” Bud said with a grin. “But I still don’t see how you focus the picture. If that chemical mist is diffused all through the air, how do you get the image to form at one place?”
“By the same wave-terminal principle I used in THE PEG-LEGGED GHOST 9
my megascope space prober,” Tom explained, referring to his electronic telescope of potentially infinite range. “That is, the telejector beams out two waves of slightly different frequency-and by varying the difference, I can adjust the range at which they’ll be exactly 180 degrees out of phase.”
“And the waves cancel out at that point?”
“Right. That point, or node, is called the wave-terminal point. Now then,” Tom went on, “the telejector also beams out a picture signal. Part of the signal passes through the terminal point as waste energy. Another part is reflected back from the terminal point to the transmitter.”
“That’s the part you use in your space prober to make the picture on the screen?” Bud asked.
Tom nodded. “Yes-but in the telejector, I use the third part of the signal. This part is absorbed right at the terminal point, and the energy causes the chemical mist to glow.”
“Giving you a single spot of light?”
“Exactly,” Tom said. “Then, as the telejector scans, it forms a complete three-dimensional image out of many such spots of light.”
“I get it now,” Bud said as he halted the convertible outside the main gate of Enterprises.
The guard stepped from the gatehouse to speak to Tom. “There was a stranger here to see you, skipper. He hung around a couple of hours, hoping you might come back after dinner.”
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