Linen-Diaphragm Speaker.

Radio Record, Volume II, Issue 5, 17 August 1928, Page 29

Linen-Diaphragm Speaker.

HIS is undoubtedly a fine type of speaker, giving a wider range of frequencies than the majority of speakers. A Wellington firm, Messrs. J. A. Smyth, 71 Victoria Street, has on order to arrive next month a shipment of these speakers knocked down ready f assembly by the purchaser. Everything necessary is included, frame, unit, silk diaphragm, "dope" for same, and «un the tacks. The large and small diaphragm is the pattern, which appears to be the one most generally adopted. The price of the kit is to be

£4 10s. A supply of extra units hag also been ordered. ) Power Line Interference. AN American claims to have solved’ the problem of getting quiet re-' ception in close proximity to high-volt-, age power lines. He has erected a’ 60-foot pole with 3ft. L-piece at top and diagonal supporting brace like a gallows. From the bracket is suspended an ordinary five-wire cage aerial with rings six inches in diameter, with lead-. in from the lower end, the total length of the cage portion being 20 feet. Oute side the end rings of the cage are suspended two aluminium rings, a foot in diameter. Six wires connect these two. rings, and the wires join at the top to form a suspension above the top of the aerial. The lower end of the ring arrangement is connected to earth by 2. suitable wire. The actual length of the outside cage or screen from ring to ring is given as 12 feet. This is giving good results within 100 yards from a 60,000-volt line.