Untitled

Radio Record, Volume I, Issue 29, 3 February 1928, Page 2

_--s he loudest sound ever made by man, such, for instance, as that of some of ‘the huge explosions in France during the war, is prohablvy incanable of travelling much more than 100 miles, and to cover that distance it would take nearly nine minutes, In a single second, wireless waves ttavel seven and a half times round the earth.