Page:United States Statutes at Large Volume 63 Part 2.djvu/618

 (<;: STrA. I MILTILAT'I'AL-TELEC IICOMMUNIATIONS-O(CT. 2. 1947 (Chapter XIV, art. 37 KR) (919-123 interval of time is to be allowed between the transmission of an alarm signal and the repetition of the distress call or dis- tress message, so that mobile stations, which do not keep con- tinuous watch and which are warned by the sounding of their automatic alarm apparatus, have time to go on watch. 919 (4) A station which repeats a distress call or distress message, follows it by the word DE and its own call sign transmitted three times. Section IX. Alarm Signal 920 § 30. (1) The alarm signal shall consist of a series of twelve dashes sent in one minute, the duration of each dash being four seconds and the duration of the interval between two consecutive dashes one second. It may be transmitted by hand but its transmission by means of an automatic instrument is recommended. 921 (2) Any ship station working in the band 405 to 535 kc/s which is not provided with an automatic apparatus for the transmission of the alarm signal, must be permanently equipped with a clock, clearly marking the seconds, preferably by means of a sweep hand completing one revolution per minute. This clock must be placed at a point sufficiently visible from the operator's table in order that the operator may, by keeping it in view, easily and correctly time the different elements of the alarm signal. 922 (3) This special signal has for its sole purpose the actuation of the automatic devices giving the alarm. It must be used solely either to announce that a distress call or mes- sage is about to follow or to announce the transmission of an urgent cyclone warning; in the latter case it may be used only by the coast stations duly authorized by their government. 923 (4) In cases of distress, the use of the alarm signal is governed by 876; in the case of an urgent cyclone warning, the transmission of the warning must not begin until two minutes after the end of the alarm signal. 81939 0-52- -PT. --- 40. 1915

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