August 1, 1916.) 



THE INDIA RUBBER WORLD 



591 



Edison X^ehicle Battery. 



of 21 per cent solution of chemically pure potassium hydrate 

 and distilled water, to which is added a small amount of lithium 

 liydratc. 



The cells are as- 

 sembled in batteries, 

 charged and dis- 

 charged three times, 

 and finally inspect- 

 ed, when they are 

 ready for use. The 

 "A" type cell with 

 4 positive plates dis- 

 charges at the rate 

 of 30 amperes for 5 

 hours, The dimen- 

 sions of the cells are 

 2 11/16 by 5;.^ by 

 13 7/16 inches high 

 and weigh, complete. 

 135 pounds. 



ST.\RT1.\(J. I.KillTINc; .\MJ UiMTloX B.^TTERIES. 

 The batteries used in connection with electric starting systems 

 are selected for their ability to crank the engine at sufficient 

 speed, and for a sufficient length of time, to insure positive start- 

 ing, especially when the engine and mechanism is stilt, dm t.' 

 cold weather or mal- 

 adjustment. 



The rates of dis- 

 charge are high, yet the 

 starting battery nui>t 

 occupy little space and 

 be of minimum weight. 

 It must w i t h s t a 11 d 

 shocks, jolts, short cir- 

 cuits, charges at 10 

 times above normal 

 rates, and discharges at 

 25 times above the nor- 

 mal or ideal rate. lir, S. Thf, Willarh St.\ktinc ]!.\ttkk\ . 



iMir lighting purposes 

 lii.gh capacity battery 

 ; necessary, owing to 

 le greater amount of 

 iirrent needed. Ani- 

 ere discharge rate plus 

 opacity in hours is the 

 Illy true indication of 

 a t t e r v value. The 

 o u e r the discharge 

 ite in amperes the 

 renter the capacity in 

 nurs obtained. Light- 

 ing batteries may also 

 be used for ignition 

 and operating electric 

 H.MTERV. horns. 



Fig. 9 



.\ tire liller that has been recently exploited in Chicago by 

 inysteriqusly withholding the name and sponsors of the com- 

 pound is now announced as "Tireoid." It is manufactured 

 by the Tireoid Co., 1200 Michigan avenue, Chicago. Illinois. 

 W. L. Rohrer, of Chicago, is president, and among other 

 prominent men connected with the company are A. Watson 

 Armour, Martin J. Insull, Lafayette Markle and James Levy. 

 The compound was invented and patented by R. T. Garvin. 



AUTOGRAPHIC FRICTION TEST OF HOSE AND 

 BELTING. 



T' 



•- methods .ind resultant autographic charts of hose 

 ind belting friction tests made on the autographic 

 ,' niaebine that was illustrated and described in Thk 

 Inhia RiBBER World, May 1, 1916, 

 are shown in the accompanying 

 illustrations through courtesy c.f 

 the Bureau of Standards. Washing- 

 ton. D. C. 



The views show only the upi)er 

 details of the machine as it appears 

 when in^^ing the tests. The one. 

 on the left is seen with the hose 

 sample in place and the auto- 

 graphic pen recording the friction 

 or adhesion between the plies at 

 all ))oints of the strip being tested 

 The sample consists of a round 

 section of hose one inch wide, antl 

 is fitted over a mandrel that re- 

 volves in a fork suspended from 

 the top of the machine, the de- 

 tached end of the fabric being s, 

 'urcd to the lower grip. 



On the right the machine i- 

 shown while making a rubber belt 

 mg test and recording the vari:i 

 lions of the friction curves at the 

 The test piece consists of a one-inch strip eon- 

 plies that are separated for a short distance to 

 for attaching the grips. One end is attached to 

 id the other to the lower grip, and as the plies 

 the autographic attachment 



same tune, 

 taining twc 

 afford spac 

 the upper : 

 arc pulled apart by the niach 



at all points of the sainple strip, 

 ' (BtcriNej 



Record of Belting Tes 



The National Rubber Co.. Elgin, Illinois 

 its capital stock from $10,000 to $60,000. 



has recently increased 



The charts shown aBove are exact reproductions of the 

 made of the above tests at the Bureau of Standards. The 

 on the left margin of the charts represent the tcn.sion in i 



The variation at any point on the strip being tested is 

 seen by referring to figures at the bottom of the charts, 

 figures represent the length nf the strip tested, in inches 



