The outer part of 

 SparOak is firm, 

 heavy, selected 

 special oak tanned 

 center stock. 



A Double Service Belt 



Most good belts are built so as to 

 have either fine pulley-gripping sur- 

 face and less rcggedness, or plenty of 

 ruggedness and less traction. 



SparOak, one of Graton & Knight Stand- 

 ardized Series Leather Belts, is a unique belt 

 because it has super-gripping power and the 

 firmness that resists the mauling of hard usage. 



The side of SparOak next to the pulley is 

 Graton & Knight Spartan — the belting leather 

 with the highest co-efficient of friction ever 

 attained in any belting material; the outside is 

 the finest quality of Graton & Knight special 

 oak tanned, extra firm center stock. Combined, 

 they form a belt of absolutely unique quality. 



The side of SparOak 

 next the pulley is 

 Spartan leather, 

 giving the maximum 

 grip on the pulley. 



parOak 



Belting 



SparOak stands high speeds without slip- 

 ping or burning. It stays flat under strain. 

 The punching of shifters and rapping of pul- 

 ley flanges affect SparOak surprisingly little. 

 SparOak belts in actual use carry their trac- 

 tion power up to speeds of more than a mile 

 a minute. In the hard test of "mule spin- 

 ning," SparOak has set new standards of 

 what belting efficiency is. 



If you have a vexatious belting problem, tell 

 us about it and let us tell you whether or not 

 SparOak is the belt required. There are thou- 

 sands of cantankerous drives in the United 

 States that will lose much of their cranki- 

 ness when operated by SparOak. If you 

 have such a one, it is well worth your while 

 to write us about it. 



Write for information about Standardization 

 as applied to Belting 



THh GRATON & KNIGHT MFG. CO. 

 WORCESTER, MASS., U. S. A. 



Oak Leather Tanners, Makers of Leather Belting, 

 Lace Leather, Packings and Specialties 

 Branches and Distributors in all Principal Cities 



GRATON & KNIGHT 



Standardized Series 



LEATHER BELTING 



WS.S. 



WAR SAVINGS STAMPS 



ISSUED BY THE 



UNITED STATES 

 GOVERNMENT 



Tanned by ui for belling use 



1 'Mention the Geographic — It identifies you.' 



