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"Science fiction is really sociological studies of the future, things that the writer believes are going to happen by putting two and two together."
- Ray Bradbury
 |
| Anti-Spying Device | ||
| Foolproof means of defending against spy beams. |
| It was not a large office, but it was quite spy-proof and quite undetectably so. Spy-beams trained upon it received neither a suspicious silence nor an even more suspicious static. They received, rather, a conversation constructed at random out of a vast stock of innocuous phrases in various tone and voices. |
| From Foundation,
by Isaac Asimov. Published by Doubleday in 1951 Additional resources -
|
Compare to the cone of silence From Cease Fire (1958) by Frank Herbert, hush corner by Robert Heinlein in Double Star and the Fenton Silencer from an early Arthur C. Clarke story.
The earliest example I know of is the isolation barrage from Wandl, The Invader (1939) by Ray Cummings.
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'Employees... were implanted with advanced microprocessors...'
'... sweating, heat-blistered engineers at every interplanetary radiograph station on three planets.'
'The huge plow... seemed to shake itself - and began to move back southward.'
'... he went to the hall closet to get his pith helmet and his mandatory cooling-unit.'
'We still use people at the main gates, but here it's an automated sentry.'
