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Radio Record, Volume III, Issue 22, 13 December 1929, Page 12

De. BR, O. HULBERT, physicist at my United States Naval Laboratory, has delivered the opinion that coinmupication with Mars is impossible on wavelengths below 100 metres owing to the density of the Martian atmosphere. WHEN a pick-up is being used with a& gramophone a certain amount of sound and "chatter" will still be heard direct from the instrument unless it has a shut-down lid. HIGH magnification factor for a valve is nearly always associated with high impedance, and a low magnification factor with low impedance.