Page:United States Statutes at Large Volume 49 Part 2.djvu/541

 TELECOMMUNICATION CONVENTION. DECEMBER 9, 1932. 2557 ARTICJ,E 30 Special Services A. METEOROLOGY [511'] § 1. Meteorological messages shall include: [620] (a) messages intended for meteorological services offi- cially charged with making weather forecasts and with the protection of maritime and aerial navigation; [621] (b) messages of these meteorological services intend especially: 1st, for mobile stations of the maritime service; 2d, for the protection of the aeronautical servi~e; 3d, for the public. [622] The information contained in these mesoages may be: (1) observations at scheduled hours; (2) notices of dangerous phenomena; (3) forecasts and warnings; (4) statements on the general meteorologICal situation. [623] § 2. (1) The various national meteorological services shall ar- range for the establishment of common transmission programs in such a way as to use the transmitters best located for such extensive areas as the latter can serve. [624] (2) The meteorological observations contained in the classes (a) and (b), 1st and 2d above (§ 1) shall, in principle, be written in an international meteorological code, whether they are transmitted by mobile stations or intended for them. [626] § 3. For weather-observation messages intended for an official meteorological service, advantage shall be taken of the facilities resulting from the assignment of exclusive waves to synoptic meteor- ology and to aeronautical meteorology, in conformity with the regional agreements established by the services concerned for the use of these waves. [626] § 4. (1) Meteorological messages intended especially for all mobile stations of the maritime service shall, in principle, be trans- mitted in accordance with a definite time schedule, and so far as possible, at hours when they may be received by those of the stations mentioned which have but one operator, the transmission speed being selected in such a way that the reading of the signals will be possible for an operator having only a second-class certificate. [627] (2) During transmissions " to all" of meteorological messages intended for stations of the mobile service, all stations of this service whose transmissions might interfere with the reception of the messages in question, must observe silence, in order to make it possible for all the stations desiring to receive the said messages Special servloel. MeteoroJou.