NEW TENNIS BALL INVENTED.

Hokitika Guardian, 22 May 1925, Page 4

NEW TENNIS BALL INVENTED.

A novel tennis hall, filled xvilli nitrogen and said to he air-tight, has been invented L.v Albert K. l’enfold, the technical expert to the Dunlop l yre Cm. Ltd., xvlto created the Alaxiii golf hall. The aim has been to avoid the present | idea i f a plug which has to he punctured in order that the hall may he blown. The ping cannot With any certainty I e scaled and ma.unfaeturers have, therefore, to scrap thousands of potential tennis halls every year. 11,i- difficulty has been overcome hy j placing certain chemicals with a small quantity of water inside* two thin gutla per; ha shells joined together like a ping-pong hall, this hollow spheic, covered with soft ruliLor, is placed in a. mould a,ml the whole is heated to a temporal tire of about IKK) degrees. That nut only vulcanises the rubber hut sets up chemical nctien between the gas-forming ingredients and inhales tii- hall." After that the moulds are | lunged into ice-cold water from a special refrigerating plant xvilli a yield

of four tons of i e a day. I lie hall is then covered with felt in ‘he ordinary way. A feature c:f it. is that it cannot he subsequently allcvC'd by a hot climate, and. f r the first time dip o tennis balls xvere m;ete. standards with seieiit ill:- exact i tiHio, Zj;e imons of the hall have been ottered to the English and other l.awn Tennis Associations for approval, and a world re ore! is said lo have been set up in the wide.snrcncl application for patents from every civilised country of the glohe.