Mav 1. 1916.J 



THE INDIA RUBBER WORLD 



403 



nm. The old style rim, when puncture or blow-out occurred, 

 many times meant hours o£ work in the putting on of new 

 tires. With many rims it was necessary to send the wheel or 

 car to the garage, before changes could be made. When a car 

 owner started on a tour, or even on a short trip, he never knew 

 whether he would reach his destination or not. All that is a 

 thing of the past. The quick-detachable, demountalile rim has 

 removed the principal worry of motorists." 



The rise of the demountable rim commercially dates back 

 hardly more than live years when judged by a widespread de- 

 mand. In the succeeding interval a very large percentage of 

 car owners have either liought machines already equipped with 

 rims of this sort or have later supplied them. This is easily ex- 

 plained. Tire changing has been one of the car owner's most 

 troublesome bugaboos in the past. We have all seen him toiling 

 by the roadside — sometimes under a broiling sun or in a pelting 

 rain, and universally in anything but a pleasant mood. The de- 

 velopment of the demountable rim altered all this ; it made it 

 possible for a damaged tire to be quickly removed, replaced \>y 

 a good one, and then carried home to be repaired at leisure. In- 

 stead of working for half an hour or more to make a change, 

 the substitution can now easily be effected inside of ten minutes. 

 It is not a case of putting on a new tire and pumping it up. 

 but, instead, the speedy adjustment of a tire already inflated for 

 service. And it is also claimed that the demountable rim obviates 

 the necessity of using over-sized tires, because the wedge feature 

 and the initial loose lit make it simply part of the process to 

 take care of the excess. 



The present-day demountable rims are adaptations of the 

 clincher rim of unit construction, so universally employed about 

 fifteen years ago. It will be remembered that the beads of the 

 earlier pneumatic tires were extensible to facilitate seating the 

 tire within the clincher rim. Stability was added to the tire liy 

 stiffening or wiring the beads, and as these could not be seated 

 readily within the clincher rim of unit construction, then came- 

 the separable rims out of which evolved the different so-called 

 quick detachable rims. But the quick detacliable rim did not 

 obviate the pumping up of the new tire, although it did make it 

 possible to remove a damaged tire and to put a good one on the 

 wheel ; but the substituted tire had then to be inflated more or 

 less laboriously. .\ notable gain in convenience and simplicity 

 was secured by the adoption of the demountable rim in place of 

 the purely quick detachable rim, and in time followed what came 

 to be known as the quick detachable, demountable rim. In the 

 case of the demountable rim we have only to loosen a few bolts, 

 six or eight, as the case may be, to make a change, and with 

 equal speed another rim, bearing an inflated tire, can be sho\ ed 

 in place and locked firmly by the bolts. 



Mr. Perlman has associated with him in this enterprise men 

 prominent financially, and men well known in the automobile 

 industry. Two manufacturing plants have already been secured 

 and contracts have been signed to supply prominent automobile 

 manufacturers with rims. Mr. Perlman estimates that the re- 

 quirements for the season of 1917 will amount to one million sets. 

 and he is confident that by August next the company will he in 

 shape to supply that demand. 



The National ^Association of Cotton Manufacturers held it-- 

 annual meeting April 26 and 27, at the Copley-Plaza, Boslon, 

 Massachusetts. The principal address on Wednesday was by 

 Frank .\. Vanderlip of Xew "S'ork City, its subject being "Foreign 

 Commerce in American Textiles." 



During the Thursday session many subjects interesting te 

 the textile industry were ably treated in carefully preparcil 

 addresses by experts in their several lines of work. In the after- 

 noon, S. W. Stratton, Ph.D., Director, Bureau of Standards. 

 Washington, D. C, read a paper on "Tests of Cotton Yarn and 



Fabrics." with illustrations. Then followed a paper, "The 

 Washington Conference and Its Relation to Tire Fabric and 

 Other Testing Requirements," by William D. Hartshorne, Chair- 

 man <if Committee D-13, of the American Society for Testing 

 Materials. 



FIFTH NATIONAL TEXTILE EXHIBITION. 



The Filth National Textile Exhibition and Third National 

 Power Shows occupied the Mechanics' Building. Boston, Massa- 

 chusetts, during the week of April 24-29. A very interesting 

 program was arranged, and the exhibits of textile machinery 

 and allied trades were fully representative of this great industry. 



.Among the exhibitors the following firms, whose names are 

 well known to readers of The India Rubber World, were noted: 

 Curtis & Marble Machine Co., Worcester, Massachusetts; Amer- 

 ican Tool & Machine Co., General Electric Co., Morse Chain 

 Co., and Westinghouse Electric & Manufacturing Co.— all of 

 Boston, Massachusetts. The exhibition was well attended, and 

 many new and improved forms of mechanism were shown for 

 the first time. The exhibits represented the most important col- 

 lection of textile machinery that has ever been arranged for 

 jjulilic exhibition. 



AUTOGRAPHIC FRICTION TESTING MACHINE. 



T 



HE Bureau of Standards, Washington, D. C, has developed 

 an autographic machine for testing the adhesion or "fric- 



r' between the plies of canvas in rubber hose, belting, etc. 



The machine is operated by a % horse- 

 power worm geared shunt motor, which 

 is belted to a cone pulley. A worm on 

 the pulley shaft drives a worm wheel 

 which is geared to a spur inside of the 

 vertical steel column. This spur drives 

 a steel rack, to the upper end of which 

 is attached the movable grip. From the 

 top of the machine is suspended a spring 

 which carries at its lower end a fork for 

 holding the test piece. Between the 

 spring and fork is a pencil holder, in front 

 of which is a drum carrying a paper 

 chart on which the record is drawn. 



The capacity of the spring is 40 pounds, 

 the extension being 1 inch for 10 pounds 

 pull. The drum is driven by a cord 

 which passes over a small guide pulley 

 and thence to a spool on the spur gear 

 shaft. The surface speed of the drum is 

 the same as the rate of separation of the 

 plies of fabric being tested. 



The method of testing rubber hose is 

 as follows : a 1-inch section is fitted over 

 a mandrel and placed in the fork 

 suspended from the top of the machine, 

 and the detached end of the fabric is 

 secured to the lower grip as shown. 



To test rubber belting, a 1-inch strip 

 containing 2 plies is used ; the plies are 

 separated for a short distance and the 

 ends secured in the two grips, the upper 

 grip being a clamp held in the fork above 

 mentioned. 



As separation of the plies takes place 

 the pencil makes a continuous record on 

 the drum, showing the adhesion between 

 the plies of fabrics at all points of the 

 fabric being tested. 



