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Taranaki Daily News, 16 April 1932, Page 13 (Supplement)

A curious way of lighting the steps in what we may call the Underground Piccadilly of Berlin (the Potsdamer Platz Station) is by means of luminous hand rails. Lamps are fitted inside the rails, which are tubular and open underneath, and the steps are thrown into brilliant relief by the bright illumination cast down on them. A wireless valve which magnifies feeble electric currents to an extent difficult for experts to understand has been invented by the General Electric Company, and shown working recently in Washington. The valve, as we all know, is the secret of modern wireless, and because it can magnify feeble currents it is coming into use for all kinds of useful purposes. This new valve, however, will magnify a current 10,000 million million times. Ils magnifying power.is difficult to realise, even by the engineers who have groduced it.