p true. To overcome these objections isthe intention of the inventor of the piston packing herewithillustrated. It requires but one set of rings, and tlieir innersurfaces need not be turned, as they fit neither inner ringsnor the periphery of the spider ; thus much time, labor, andexpense are saved… … most cases two are sufficient. A portion of each ring formsa spring, a bolt. E, on the opposite side passing through theperiphery of the spider and engaging with the ring. This,as seen in the engravings, forces tho ring for one half or twothirds its circum ference against the internal surface of…
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