Locomotive appliances . ance in the action of the instrumentwhich made the diagram inaccurate. The object sought by the inventor of the Taborindicator was to better adapt the instrument to theattainment of smooth and accurate diagrams at highspeeds. He endeavored to provide a movementhaving such few parts, and those of such light weight,that a quick response to the action of the steam pres-sure should occur at any speed liable to be met inpractice. The employment of high speeds is now offrequent occurrence on stationary and marineengines, and suitable provisions for indicating inthose cases ha
Locomotive appliances . ance in the action of the instrumentwhich made the diagram inaccurate. The object sought by the inventor of the Taborindicator was to better adapt the instrument to theattainment of smooth and accurate diagrams at highspeeds. He endeavored to provide a movementhaving such few parts, and those of such light weight,that a quick response to the action of the steam pres-sure should occur at any speed liable to be met inpractice. The employment of high speeds is now offrequent occurrence on stationary and marineengines, and suitable provisions for indicating inthose cases have become a recognized necessity. LOCOMOTIVE APPLIANCES. 393 Description.—A prominent feature of the Taborindicator lies in the means employed to communicatea straight-line movement to the pencil. A stationaryplate containing a curved slot is firmly secured in anupright position to the cover of the steam slot serves as a guide and controls the motion ofthe pencil bar. The side of the pencil bar carries a. Fig. 1. Tabor Indicator Fitted with Drum Stop Attachment. roller which turns on a pin, and this is fitted so as toroll freely from end to end of the slot. The curve ofthe slot is so formed, and the pin attached to such , that the end of the pencil bar which carries thepencil moves up and down in a straight line whenthe roller is moved from one end of the slot to t he curve of the slot just compensates the tendency o[ 394 LOCOMOTIVE APPLIANCES. the pencil point to move in a circular arc, and astraight-line motion results. The outside of thecurve is nearly a true circle, with a radius of one inch. The steam cylinder and the base of the paper drumare made in one casting. Inside the steam cylinder isa movable lining cylinder within which the piston ofthe indicator works. This cylinder is attached bymeans of a screw-thread at the bottom, and openingson opposite sides at the top are provided for the intro-duction of a tool for screwing it in or out.
Size: 1883px × 1327px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectlocomot, bookyear1901
