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"I'm strictly an ivory-tower person. I can explain things but I can't do things."
- Isaac Asimov
 |
| Stationary Automatic Blaster | ||
| An automated defensive blaster. |
| "Gimme that chair. I'll demonstrate the gimmick." He stuck it out into the doorway. Instantly two bolts cut across the door, parallel to the ground..."
"Anybody here enough of a technician to sneak up on it and pull its teeth?" ..The colonial trotted ahead, swung around behind the shield covering the stationary automatic blaster, and stopped. He worked away for several minutes, then there was a white flash, intensely bright. He trotted back. "Shorted it out. Bet I blew every overload breaker in the power house." "Sure you fixed it?" "You couldn't dot an 'i' with it now." |
| Technovelgy from Red Planet,
by Robert Heinlein. Published by Scribner in 1949 Additional resources -
|
As presented by Heinlein, this device does not appear to be a fully automated sentry gun that detects intruders in a wide area. It works on a simpler sensor, like an electric eye beam. If you break the beam, the gun fires.
Compare to the blaster from When the Green Star Waned (1925) by Nictzin Dyalhis, the neutron disruption blaster from The Complete Paratime (1951) by H. Beam Piper and the meteor blasters from First Contact (1945), by Murray Leinster.
"Becher didn't try to keep men outdoors all night - at least I don't think so. It's automatic. They've put an electric-eye grid across the door. When you break it, a bolt comes across, right where you'd be if you walked through it."
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'...small electric motors at the principal joints worked the prosthetic framework by means of steel cables...'
'Living protoplasm incorporated into the Ampek F-a2 recording system...'
'Twoflower's Luggage, which was currently ambling along on its little legs...'
'He came to as the ship went into free flight, arching in a high parabola over the plains...'
'The peculiar quality of this light, which gave it its great preeminence over all other penetrating rays...'
'The overworked leg motor would have to cool down before he could work on it...'
‘Where to, sport?’ the starter at cab relay asked.
