Image Captions:

Fig. 9. Receiving Wave Antenna at Houlton, Maine.
Fig. 12. Short-wave Transoceanic Telephone Receiver.
Fig. 13. Oscillographic Records of Short-wave Selective Fading Tests.

Text Appearing After Image:
Fig. 9. Receiving Wave Antennaat Houlton, Maine. Fig. 12. Short-wave TransoceanicTelephone Receiver. hi Scnt^ As Received —- ■ -Freq.- MM 1 0m u . Mi 1— K Second * Fig. 13. Oscillographic Records of Short-wave SelectiveFading Tests. TRANSOCEANIC RADIOTELEPHONY transmission unique in radio, giving a power effectiveness sev-eral times as great as the ordinary method. In the usualmethod used in broadcasting and for short-wave systems, thereis transmitted continuously a constant carrier wave whichcarries no intelligence but is necessary to permit a simple de-tecting apparatus for receiving. There are also two bands offrequencies resulting from modulation, called sidebands, onejust above the carrier frequency and one just below it. Eachof these sidebands carries the message in full. The single-sideband-carrier-eliminated method of telephone transmission,originally developed for wire carrier telephony and now ap-plied to long-wave radio, lops off one sideband and the carrierand transm

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