India rubber world . the use of a rubber core in two sections, joined together by screw threads; within which is placed a small ballof aluminum, the inside ofthe rubber core being soformed as to provide anumber of air cells. Thewhole is placed within aGutta-percha cover. Theillustration herewith showsthe method of joining thetwo sections of the rubbercore, which is pointed outas having advantages overrubber wound into a core in the form of thread. The cover may also be formed of semi-hard rubber, with which aluminum has been compounded. Patents have been applied for. [The Akron Dental Rubber C
India rubber world . the use of a rubber core in two sections, joined together by screw threads; within which is placed a small ballof aluminum, the inside ofthe rubber core being soformed as to provide anumber of air cells. Thewhole is placed within aGutta-percha cover. Theillustration herewith showsthe method of joining thetwo sections of the rubbercore, which is pointed outas having advantages overrubber wound into a core in the form of thread. The cover may also be formed of semi-hard rubber, with which aluminum has been compounded. Patents have been applied for. [The Akron Dental Rubber Co., Incorporated, Akron, MORE KROTZ TIRE newly formed Krotz Manufacturing Co. (Springfield,Ohio) have for their object the exploitation of rubber vehicle tires under pat-ents issued to Al-varo S. Krotz. Inthe last IndiaRubber World[page 421] was il-lustrated the es-sential featurecovered by the first Krotz patent. Under date of September6 another United States patent [No. ] was issued to
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