. The locomotive engineer . front view is nest <lrawn by projecting fromthe plan the lines representing (he width of thecrosslicjid. both of Ihe top and wings, afterwhich the center line ff /. is to be drawn, and fromwhich the thickness of body and wings is to belaid off. At the intersection of center lines, thecircles representing the large and small diametersof the piston fit nre to he described, and the frontelevation is completed. To still further illustrate the subject, let us makeone more section. Supposing the crosshead to hecut on line/.f; this will give us a transverse sec-tion loo
. The locomotive engineer . front view is nest <lrawn by projecting fromthe plan the lines representing (he width of thecrosslicjid. both of Ihe top and wings, afterwhich the center line ff /. is to be drawn, and fromwhich the thickness of body and wings is to belaid off. At the intersection of center lines, thecircles representing the large and small diametersof the piston fit nre to he described, and the frontelevation is completed. To still further illustrate the subject, let us makeone more section. Supposing the crosshead to hecut on line/.f; this will give us a transverse sec-tion looking toward the journal. In order to draw this section, produce the lopand hollom lines of longitudinal section a conveni-ent distance, also the center line, and erect a per-pendicular at such a distance from the section al-ready made as will bring the proposed section inthe same relation lo the one made as the latteris to the plan. This suggestion is made no asto linve II well uniercd arrangement of views. T ! : Illill 1 ,. The center lines are the poinia from which alldimensions are to be laid off, same as when makingthe drawing. Intersection of center lines at sides forms the cen-ters on which Ihe journal is to be turned; intersec-tion of center lines at cod locales the center of holefor piston fit, Ihe core of which, by the way, $Juiuldhave a piece of pine neatly fitted, having a tin cen-ter, from which lo describe the circle representingthe hole for piston. From this center another andlarger circle should be described, by which thecrosshead is set true in the lathe when boring thehole. This Inst operation, and laying off the key-way, is deferred until the crosshead is planed inmany cases. Sluch laliludq is taken in the matter of sections,as, if it is desired to show the interior of merelyone special part on a drawing, it is done by show-ing it cul away at the particular place to be repre-senteii, and not carry section through the wholeplane where shown. A reference to Fig.
Size: 1721px × 1452px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1888
