A very small slip, at just the wrong place, can devastate any enterprise. One tiny transistor can go wrong ... and ruin a multi-million dollar missile. Which would be one way to stop the missiles.... (reprinted in 1963 as Supermind.)
e. Division III, Malone remembered, was devoted to non-poisonous substances--like clay or sand found in boots or trouser cuffs, cigar ashes and such. They were placed on the same floor as Fingerprints to allow free and frequent passage between the sections on the problems of plastic prints--made in putty or like substances--and visible prints, made when the hand is covered with a visible substance like blood, ketchup or glue.
Malone found what he was looking for at the very end of the floor. It was the Computer Section, a large room filled with humming, clacking and buzzing machines of an ancient vintage, muttering to themselves as they worked, and newer machines which were smaller and more silent. Lights were lighting and bells were ringing softly, relays were relaying and the whole room was a gigantic maze of calculating and control machines. What space wasn't filled by the machines themselves was filled by workbenches, all littered with an assortment of gears, tubes, spare relays, transistors, wires