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Radio Record, Volume V, Issue 22, 11 December 1931, Page 2

J[NTERMITTENT signals; clear one moment and weak the next, can often be traced to a coil fitting loosely in its holder. ~ [THE loudspeaker is one of the most / inefficient of our instruments, for less: than five per cent. of the power put into it reappears as sound-energy. HEN tuning.suddenly jumps from one setting to.another apparently without any reason at all, the earth connection is generally at fault.