BEAM WIRELESS

Evening Post, Volume CVIII, Issue 130, 28 November 1924, Page 7

BEAM WIRELESS

CANADA'S NEW STATION.,

(UNITED ?RESS ASSOCIATION.—COPIRIOHT.)

(AUSTRALIAN-NEW ZEALAND CABLE ASSOCIATION.) OTTAWA, 26th November. -The first.of.five steel.towers, 350 feet in" height, for communication by the Marconi beam system of radio with similar stations now being erected in England, on behalf of the British Post Office, has been completed at Drummondville, near Montreal, i This will be the first station in America to use the beam system of transmission for commercial telegraphy. A receiving station on the same circuit is.being built at Yamacbiche, Quebec. ■ "

The five masts mentioned will be used to support, not .the aerial of the transmitting station, but the "reflector," which -will concentrate the radiated energy into a "beam" for transmission across the Atlantic. The reflector consists of a large number of vertical wires placed a short distance apart, and arranged in a parabolic curve. If .an egg is cut in half lengthwise, the curve of the 'small end is approximately parabolic. The aerial, which is in this equipment vertical, and is shorter than the reflector wires, is placed within the reflector, in tha focus of the parabola. Using the illustration of the egg again, the focus of the curve is roughly a quarter of an inch from the "small end." The reflector wires act electrically almost as if they formed a continuous sheet.