. Railway mechanical engineer . should be coated with either graphite or chalkto prevent adhering to the metal when the joint is to bebroken.—Power. CLIPBOARD FOR ANALYZING INDICA-TOR CARDS BY H. K. FOX Motive Power Inspector. Western Maryland, Hagerstown, Md. Within the past eight months we have taken about 1,400indicator cards and the task of integrating them is no smallone. The method heretofore followed was to pin a card ona drawing board with two thumb tacks, the surface for theplanimeter wheel to roll over usually being a piece of smoothpaper. For the integration of the diagram areas of
. Railway mechanical engineer . should be coated with either graphite or chalkto prevent adhering to the metal when the joint is to bebroken.—Power. CLIPBOARD FOR ANALYZING INDICA-TOR CARDS BY H. K. FOX Motive Power Inspector. Western Maryland, Hagerstown, Md. Within the past eight months we have taken about 1,400indicator cards and the task of integrating them is no smallone. The method heretofore followed was to pin a card ona drawing board with two thumb tacks, the surface for theplanimeter wheel to roll over usually being a piece of smoothpaper. For the integration of the diagram areas of a cardthis method gives a fair degree of satisfaction, but the realdifficulty came when drawing parallel vertical lines at frac-tional parts of the stroke. When doing this with a pair oftriangles several adjustments were frequently necessary tofinish one card and a further annoyance was found in thetack heads, over which one of the triangles frequently hadto be placed. To overcome these obstacles to a quick solution, a clip-. Clipboard Used in Analyzing Indicator Cards board was designed as shown in the illustration. On thisboard the cards are very quickly applied or removed, andthis can be done as many times as desired without the leastinjury to the card. The clip firmly holds the card in positionand a small straight edge is glued on the board to serve asa guide for the triangle. The board itself is about Y& , 9 in. wide, and 13 in. long. The straight edge is thick and in. wide, and is set about 3*4 in. fromthe edge of the board, the set screws on the under side of theplanimeter clearing it nicely. The clip is 3 in. wide, beingmade from an ordinary 6 in. clip by cutting off the properamount from each wing. The board is of hardwood and thesurface over which the roller wheel runs has been speciallyprepared to provide an extremely smooth, glass-like finish. As to the saving in time required for working up cards,about five cards are now being analyzed in the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
