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200-WATT TRANSMITTER OF IN THE LIGHTHOUSE TYPE USED SERVICE acter of the men who make up the body of lighthouse keepers on the Great Lakes. The code machine is entirely auto- matic in its operation thus making the services of a radio operator un- necessary... The code is formed by a series or combination of short and long segments on a revolving code tacts as the wheel is revolved, to pro- duce dots and dashes. This wheel is revolved by an electric motor through reduction gear which also drives a contacting cam designed to open and close the circuit so that any desired combination of “on” and “off” operat- ing intervals may be obtained. Much of the equipment utilized at these radiobeacons is manufactured within the lighthouse service. Until late in the fall of 1927, all radiobeacons had been operating on a wave length of 1000 meters. At that time an important test of vary- ing frequencies was made to determine the effect in elimination of interfer- ence, and as a result the wave lengths of stations have now been permanently staggered between 950 and _ 1050 meters, the band authorized for these beacons. It is anticipated that this action will largely eliminate inter- ference troubles previously encountered at times. The Great Lakes are _ peculiarly adapted to this type of aid to navi- gation and it is gratifying to note that although somewhat late in start- ing, progress in the installation of the radiobeacons and radiocompasses in this locality has been extremely rapid. When it is considered that each important freight steamer may pass a given station between 60 and 70 times in the course of a season and under present conditions is able to obtain a check on its position by radio bearing at almost any hour of the day or night, regardless of weather conditions, the importance of the system to this vast commerce can be understood. The system of radiobeacons has been installed and is operated by the United States lighthouse service of the department of commerce. The bureau of lighthouses at Washington is in charge of Mr. G. R. Putnam, commis- sioner of lighthouses, and the service ‘wheel making short or long brush con-on the Great Lakes is directly in * DETROIT RIVER LIGHTHOUSE—VESSELS ARE GUIDED BY RADIO TO THE MOUTH OF THE DETROIT RIVER FROM LAKE ERIE charge of superintendents of the tenth, eleventh and twelfth lighthouse dis- tricts with headquarters at Buffalo, Detroit and Milwaukee, respectively. Load Line Committee The secretary of commerce has or- ganized a committee to study load line legislation for American vessels in order to make recommendations for appropriate legislation. The na- tional council of American shipbuild- ers appointed H. C. Towle of the Bethlehem Shipbuilding Corp. as _ its representative on this committee. Members will also be appointed by the shipping board, steamship owners, American bureau of shipping and ma- rine underwriters. Legislation is now being proposed to authorize the sec- retary of commerce to establish regu- lations in accordance with the prac- tice of other maritime nations for load waterlines for American freight ves- sels of 250 gross tons or over en- gaged in foreign trade and for simi- lar vessels of other nations sailing from American ports. LEFT—PASSAGE ISLAND, ROYALE AND PASSAGE ISLAND. RIGHT—LAKE HURON LIGHTSHIP. 46 LAKE SUPERIOR, VESSELS AIDED BY RADIOBEACON AT THIS STATION IN FIRST LISHED ON THIS VESSEL, JUNE, 1925 MARINE REVIEW—May, 1928 PASSING BETWEEN ISLE RADIOBEACON ON GREAT LAKES ESTAB-