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‘ bruary, 1919 THE MARINE REVIEW INSPECTION When you receive Rivet Sets, see that these. details of manufacturing have been followed: (1) Top of shank must be at a right angle to side of shank (3) also free of tool marks. If it is not, the plunger in air hammer will not hit squarely, causing the rivet set to bind in the gun barrel, and the tool marks will tend to ruin the face of plunger. s (2) Shank should be ground after hardening and be absolutely free from tool _ marks and scale. If it is not, the tool marks or scale, be it ever so fine, will soon cut the gun barrel and make it useless. ~ (3) Shank should not be smaller than 1.213" or larger than 1.217". If it is, it will rattle around in gun barrel or bind when heated. (4) Radius must be absolutely free of tool marks. If it is not, the tool marks will weaken the shank and be the starting place of a fracture. (5) Should be rounded. If it is not, it is liable to cut the user. (6) Body should be free from tool marks. If it is not, it will blister the Riveter’s hand, or wear out the leather guard faster than necessary. (7) Face should be parallel with top of shank. ROTHWEILER & CO. MANUFACTURERS SEATTLE, U.S. A. Every engineer knows the severe tests to which Marine Packing is sub- jected; he knows that the conditions under which this packing is used are exceedingly hard—and that only the very highest grade packings can make good. he ie he hel G8 BY ott Tr Rd pd Sa An eb ys Gr os i gs The United States Rubber Company’s packings for marine service have made good in every instance—and are the first choice with discriminating engineers. Packings for every purpose in the marine field. The world’s largest rubber manufacturer. United States Rubber Company Mechanical Goods Division Please mention THe Marine Review when writing to Advertisers