I see that wireless in the home is likely to develop a new utility presently. Housewives will be interested in the discovery, just announced, of a Danish scientist, that such food-stuffs as milk, vegetables and fruit can be kept fresh indefinitely if they are placed within the range of an ultra short-wave radio ray. The wave length of this ray is as low as 25 centimetres, or more than 6,000 times shorter than the wave used by the Daventry national wireless transmitter.
The action operates through walls, metal or wooden containers, and through glass. A tiny instrument, little larger than a portable wireless transmitter, and using less power than an ordinary electric light globe, is sufficient to keep fresh anything stored within a radius of sixty or seventy feet, according to the scientist's claims.
Experiments in Amsterdam are reported to have been satisfactory. Eggs broken and put on plates have been kept fresh for several months, while equally definite results have been obtained with milk, which has kept good for several weeks. Pears have remained unchanged by exposure, and the same applies to new potatoes which had been taken from the ground more than a year previously.
The Irish Times, June 9th, 1931