Radio Broadcast (May-Oct 1922)

Progress of Radio in Foreign Lands 251 stroyer, Semmes, was used later in public demonstrations, one of those who took charge, Captain Battle of the Cunard liner, Virgilia, though a total stranger to the system, by relying on a certain constant signal strength from the port coil, steered the Semmes along the twenty miles of the cable always within fifty yards of it, and always on the correct side of the channel. The power used was supplied by commercial sources via Fort Lafayette. It was demonstrated that a current flow of three amperes was sufficient for all needs in water up to 200 feet. Other conclusions reached by the expert radio aid in charge, A. Crossley, pointed out that a collector coil having 800 turns of wire gave twice the audibility of the 400-turn coil; that the coils obviously must have identical electrical constants; that the use of tuned resonant receiving circuits increased the efficiency of the system 1,000 per cent., under which condition the cable can be picked up at Progress of Radio WORD has been received that the three daily newspapers in Vancouver, British Columbia, have each installed high-power radio sending equipment, by means of which isolated camps and farms are being brought into touch with the happenings of the outside world. Statistics recently published in the United States show that, whereas six months ago there were less than 50,000 receiving outfits in the whole of the country, and 40,000 of these within 100 miles of New York, to-day there are at least 800,000 of them, and the demand continues to be so great that the factories cannot cope with it. There are well over 200 radiophone broadcasting stations now in operation in the United States, and we can be certain that our neighbor to the north is becoming quite as enthusiastic about radio telephony as we are. In a short time we shall be listening in to Canadian broadcasting stations along with our own home stations. At a conference recently held in France by the airway manage'-s and pilots in order to draw up rules Lo prevent a recurrence of such an air collision as that which took place over 1,000 yards on either side of the cable, "which," he adds, "further increases the possibilities of the system for deep-water work." He remarks that very little difference was noted in the received signal strength when the coil was submerged or placed above the surface of the water, and that the use of the loudspeaker was found to be impracticable as the minute energy received from the cable at a distance will not actuate the diaphragm of a loud speaker —only when the vessel was within forty yards of the cable would the loud speaker operate. There are practicable refinements in the cable used and in the receiving equipment, which the Navy is developing. And there is a future for the audio cable, the Navy officials are agreed. Its fullest usefulness at American ports and elsewhere waits, however, on that larger appreciation of radio devices for sea as well as air navigation which pilots, both on the sea and in the air, expect, but do not as yet demand. in Foreign Lands Northern France on April 7th, among other resolutions the following were passed: That all commercial airplanes must be equipped with radio telephones; that additional ground radio and weather reporting stations should be established at Poix and Noailles on the French section of the London-Paris airway; that the terminal air stations of Croyden and Le Bourget should now be in constant communication with each other by radio telephone as well as by ordinary radio; that the question of interference with radio telephony by the powerful Eiffel Tower radio station should now be investigated; that the ground radio station at St. Inglevert, on the French coast, which was destroyed by fire recently should now be replaced. RADIO ON FISHING BOATS ACCORDING to an article in a recent L Bulletin of the Oceanographical Society of France, it appears that despite the interruption due to the war, considerable progress has evidently been made in the extension of radio communication to the French fishing fleet. In the space of ten years radio apparatus has been installed on some 200 vessels. In order