. Canadian machinery and metalworking (January-June 1919). ver to the true length line and measur-ing either the distance from the bottomup or the centre down on the line which?sponds to it on the pattern, and< onnecting the points thus obtained bystraight lines we get the shape of thetop. To cover the top it is thereforeonly necessary to transfer the view ofthe cut to the position shown at the topof the pattern. An elbow made up of cylinders, cutN as to make an offset connection andthe method used for laying out is shownby Fig. 7. First divide the circle or planview into a number of parts
. Canadian machinery and metalworking (January-June 1919). ver to the true length line and measur-ing either the distance from the bottomup or the centre down on the line which?sponds to it on the pattern, and< onnecting the points thus obtained bystraight lines we get the shape of thetop. To cover the top it is thereforeonly necessary to transfer the view ofthe cut to the position shown at the topof the pattern. An elbow made up of cylinders, cutN as to make an offset connection andthe method used for laying out is shownby Fig. 7. First divide the circle or planview into a number of parts equall-ed (twelve in this case) and fromthe points on the circle project down tothe front view as shown, next lay offn a straight line twelve parts whichcorrespond to the circumference of thecircle, and starting with the centre linelay-off the heights A to A1, B to B1, etc.;these points we connect with a curvedline, and as the lower piece is twice F/G. 9. DEl/ElOPCtEHT OF TffUSTUM OF /7 COME Top VI £h/. Outline of fonehefore Shapwy Cist-out oh. tained hy meas-uring arounotcircte \ /n top Vied. see tlrrouJ. f/fo/vr Me*/ S/P£ Vl£l*> FIG. 9-DEVELOPMENT OF FRUSTUM OF A CONE. 202 CANADIAN MACHINERY Volume XXL ing a frustum of a cone; first draw threeviews of the cone, next divide the circleand project down to the base as describ-ed for Fig. 7, and from these points inthe base draw lines to the apex; to getpattern, with compass set to radius B-C,draw an arc and lay off on this- arctwelve spaces equal to the spaces in thecircle; now, to get the shape of line Dwe follow the order of numbering inthe various views and measure up fromthe lines. As can be seen, we drawa straight line from where the point tobe measured intersects with the cut tothe outside lines, which are the only truelength lines, all the others being lineswhich slope either towards or away fromthe eye, and for that reason are not seenin their true length. Now, to get theshape of the cut-out A1, lay off the di
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmachinery, bookyear19
