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Dunstan Times, Issue 3138, 9 October 1922, Page 7

Although wireless telegraphy lias been used so largely on the surface and in the air, very little has hitherto been done to utilise it as a means of communication underground. The possibilities in this direction are illustrated in a very interesting fashion by experiments recently made in a British coal mine. An aerial was set up in an underground region a quarter of a mile distant in every direction from tho open. With quite a small apparatus signals were heard from a number of high-power transmitting stations, including tho large station near Berlin. A workman painting the Great Northern Hotel at Lincoln (Eng.) recently had a wonderful escape; from death. The; hotel adjoins the railway, and tho painter was on the top of a ladder, the foot of which was on the line. A passing train took the base clean off the ladder, which "slipped down" without overturning, and the painter at the toj) merely suffered from fright.