63 STAT.] MULTILATERALTELECOMMUNNICATIONS-OCT. 2 , 1947 (Chapter I, art. 1 RR) (6-17) 6 Radio: A general term applied to the use of Hertzian waves. 7 Telegraphy: A system of telecommunication for the transmission of written matter by the use of a signal code. 8 Telephony: A system of telecommunication set up for the transmission of speech or, in some cases, other sounds. 9 Television: A system of telecommunication for the transmission of transient images of fixed or moving objects. 10 Facsimile: A system of telecommunication for the transmission of fixed images with a view to their reception in a permanent form. 11 Radiolocation: Determination of a position or of a direction by means of the constant velocity or rectilinear prop- agation properties of Hertzian waves. 12 Radionavigation: Radiolocation intended solely for the determination of position or direction or for obstruction warning, in navigation. 13 Radar: Radiolocation system where transmission and reception are carried out at the same location, and which utilizes the reflecting or retransmitting properties of objects in order to determine their positions. 14 Primary Radar: Radar using reflection only. 15 Secondary Radar: Radar using automatic retrans- mission on the same or on a different radio frequency. 16 Radio Direction-Finding: Radiolocation in which only the direction of a station is determined by means of its emissions. 17 Telegram: Written matter intended to be trans- mitted by telegraphy; this term also includes radiotelegram unless otherwise specified. 1583
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