SCIENCE NEWS – 1604

$1.65

We reprint a 1931 interview with Dr Sergius P. Grace of

Bell Telephone Laboratories in the USA, in which he

describes amazing devices to improve hearing, prevent

eavesdropping and photograph living cells without the

use of stains.

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Description

SCIENCE NEWS – 1604

We reprint a 1931 interview with Dr Sergius P. Grace of Bell Telephone Laboratories in the USA, in which he describes amazing devices to improve hearing, prevent eavesdropping and photograph living cells without the use of stains. Some of these technologies which have not seen the light of day have likely been classified as secret.