Two Voices, One Ear

Pilots of transport planes work with two kinds of audible radio signals: continuous flashes of the radio beacon marking the course, and occasional spoken words from ground stations. Heretofore a complete receiving set was required for each purpose. Last week after months of work by Radio Engineers F. E. Gray and A. W. Parkes, Eastern Air Transport announced development (with Aircraft Radio Corp.) of a dual coil attachment by which one receiver can do all the work. As installed on E. A. T.'s Condors, the device reduces radio weight from 110 lb. to 80 lb., eliminates $550 worth of equipment. With fewer parts the new set can be inspected in half the time.

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