OCR Text |
Show PLAN FOR LAPPING PISTONS Of Many Substances Used In Operfi- ' tlon Rotten Ston Has Been Found ' Mo it Satisfactory. , Many Hiibstniiees are used In the j opcrntlou of hipping pistons. Among I thorn nro line eiifer.v dust, ground glass and rotten stone, of which the latter gives best results. When the glass la j umm! there Is iiHvnjs a possibility that I some partleles of It will be'om Imbedded Im-bedded lu piston or cylinder metal. Itttclug drhers use rotten stone, mixing a little ejlluder oil with It to form a thin paste In lupplttg the piston j It should be glwn both a reciprocating I ftud oscillating motion. i |