. India rubber world. tubes in the exterior it resembles anyordinary inner tube, but by reference tothe cross sectional views it will be seeny that it differs radically from the usual con-struction. The three tubes are shown atA B and C. They may be inflated inde-pendently, one at a time, by means of aspecially constructed tire valve D, whichhas three separate air passages leading tothe three tubes. When the tube is placedin the tire the section A is first inflated byturning the valve so that the proper airduct communicates with this section. Thecompressed air in the tube A flattens the
. India rubber world. tubes in the exterior it resembles anyordinary inner tube, but by reference tothe cross sectional views it will be seeny that it differs radically from the usual con-struction. The three tubes are shown atA B and C. They may be inflated inde-pendently, one at a time, by means of aspecially constructed tire valve D, whichhas three separate air passages leading tothe three tubes. When the tube is placedin the tire the section A is first inflated byturning the valve so that the proper airduct communicates with this section. Thecompressed air in the tube A flattens thewalls of the tubes B and C against theouter walls as shown in Fig. 1, and the tire is run withthe one tube inflated until a puncture occurs. Then instead ofhaving to replace the tube, or to repair the puncture, the valveis turned into such a position that either tube 5 or C may beinflated. In Fig. 2 the tube C is shown inflated so that itentirely fills the internal space of the tube A, and at the same Republic New Triple Inner Tube. time increases the thickness of the tread portion of the this tube becomes punctured the third tube may be in-flated and used until a third puncture occurs. The advantagesof such a tube may be readily recognized by any driver who hashad the experience of having to stop by the wayside and spendmany valuable minutes in repairing a puncture. [U. S. PatentNo. 1,078,515.] January 1, 1914.; THE INDIA RUBBER WORLD 203 New Rubber Goods in the Market. PORTABLE LAMP WITH RUBBER SUCTION CUP. entirely new in a porlalilc elccuic lami) has re-cently made its appearance on the market. It embodies sev-eral new features which make for great convenience, in-cluding a rubber suction cup by means of which the lampmay be stuck to any smooth surface with the bulb and re-
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