Slide-Rule

Of course the slide-rule isn't an sf idea per se. But it's interesting to see how long authors thought it would be in general use in the future.

year written year set author title quote note
1967 First prototype of a pocket calculator (TI)
1968 2010 John Brunner Stand On Zanzibar You don't memorize log and sine tables; You buy a slide-rule or learn to punch a public computer!
1972 First scientific pocket calculator (HP 35)
$Date: 2018-01-03 00:03:06 +0100 (Wed, 03 Jan 2018) $