A Two-valve Helmet Set
MT A WIRELESS set fitted to ‘2 London policeman’s helmet was the most novel display at the Radio Dxhibition at Olympia, which opened on September 19. The cone-shaped back of the London helmet provides an ideal loudspeaker, while the top portion accommodates the aerial and the tiny batteries needed to supply the two-valve set used. Though the total weight of the complete outfit is only a few ounces, the wearer can pick up messages broadcast from headquarters within a range of eight miles. Qo OOO OO nee eee
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https://paperspast.natlib.govt.nz/periodicals/RADREC19300926.2.31
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Radio Record, Volume IV, Issue 11, 26 September 1930, Page 8
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92A Two-valve Helmet Set Radio Record, Volume IV, Issue 11, 26 September 1930, Page 8
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