. Railway mechanical engineer . ying and locking the seal is clearlyshown in the illustrations. After being properly insertedthrough the hasp lock of the car door the seal is locked bytwisting the vertical end of the wire about the horizontal endnear the flat loop. On the side of the vertical portion ofthe wire which comes on the inner or compression side of thetwisted loop formed in locking the seal, is a series of nickswhich insure that the seal may be locked without danger of STEVENSON NUT LOCK The most severe test that can be given any nut locking de-vice is to use it at a busy railway cro
. Railway mechanical engineer . ying and locking the seal is clearlyshown in the illustrations. After being properly insertedthrough the hasp lock of the car door the seal is locked bytwisting the vertical end of the wire about the horizontal endnear the flat loop. On the side of the vertical portion ofthe wire which comes on the inner or compression side of thetwisted loop formed in locking the seal, is a series of nickswhich insure that the seal may be locked without danger of STEVENSON NUT LOCK The most severe test that can be given any nut locking de-vice is to use it at a busy railway crossing on rail and frogIjolts. Such a test has been made of the Stevenson Permanentnut l(xk, manufactured by the Iennanent Ircxiucts Company,Cleveland, Ohio. The results of the test were satisfactory;for a period of a year, none of the bolts and nuts appliediiecame The illustration shows the arrangement ofthe Stevenson nut lock and its simple construction. Thebolt has tapered grooves on opposite sides, the grooves Ijeing. Stevenson Permanent Nut Lock. deeper at the point of the bolt and gradually lessening indepth. The washer used has tw-o inner extending lugs tofit the grooves on the Ijolt. The nut has recesses on threeof its outer edges to receive the upset portion of the outerrim of the w-asher after the nut has been tightened. Tlie construction indicated insures the easy applicationof the washer to the bolt Ijefore applying the nut, as the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
