Page 4 Advertisements Column 2

Greymouth Evening Star, 9 August 1935, Page 4

SLOT ’PHONES & STAMP-SELLERS. The credit for the skilfully designed mechanism in the slot telephone and the automatic stamp-vending machine can be given wholly to New Zealanders. The timing attachment now being fitted to slot telephones m automatic exchange areas to place a

reasonable limit on the duration of the call was designed by the Department’s staff. Every part of the New Zealand slot telephone, except the microphone and the automatic dial, is made in New Zealand, and the complicated electrical and mechanical devices necessary to provide an efficient penny-in-the-slot ' telephone all owe their origin to New Zealand brains. When the slot telephone was introduced in 1910 there were no automatic exchanges. Their appearance raised new problems for the engineers and mechanicians, who have successfully adapted the slot telephone to the new svstem. Cleverly designed but remarkably simple in operation is that portion of the slot telephone which deals with the coin and infallibly rejects all but the genuine. All the essential features of a genuine coin are necessary to operate the circuit, otherwise the coin will be diverted in such a way that the mechanism will not respond. Although the machine-printing telegraph does not owe its origin to New Zealand, many useful adaptations of its mechanism evolved hy the Department’s staff have been adopted by other postal organisations, their utility having been definitely proved in practical use. The stamp-vending machines were invented by a Post and Telegraph employee, and the apparatus dealing with the coin is of particular interest. Those who use the machine know that i firm pressure has to be exercised to force the coin into the slot, and it is this power transmitted to a heavy weight which operates the quite simple but positive mechanism to feed forward one stamp and hold it irmly in position until the purchaser ms ripped the perforation. The inroductiou of the new issue of picorial stumps involved modification of ill the vending machines, because the damp perforations were not exactly he same as those of the King George ssue. The gripping device had to be aried a tiny fraction of an inch to , nsuie that when purchasers remove , he stamp it will be a clean tear along he perforations and—still more im- ■ ortant officially—that they will only ] et one stamp for their penny. t

RHEUMATIC GOUT RELIEVED. "I could not walk or wear boots," writes a North Auckland man, “but to-day I am properly cured, thanks to your RUM ACAI’S.” By dissolving uric acid crystals, HUMACAI’S bring permanent relief from all rheumatic complaints. Money-back guarantee, h'h’iu-; booklet from m. McDonnell. I’rovi mm Merchant.—Ad vt.

Tito popularity of TONNING’S LINSEED EMULSION (or coughs, colds and nil such chest and Inng complaints is us best recommendation, i Acts instantly. Pleasant to take. Safei for young or old, 1/6, 2/6 and 4/6 1 everywhere.--Advt.