Image from page 187 of "Laying out for boiler makers and sheet metal workers; a practical treatise on the layout of boilers, stacks, tanks, pipes, elbows, and miscellaneous sheet metal work" (1907)
Publisher: New York, The Boiler maker
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress
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f the linegiven here. Allowances must be made for flange at the base ofhood, also rivet holes for laps and butt straps. By making more spaces in the plan you will of course makemore triangles, and in this way you will be able to overcomethe irregularities on the pattern, such as the corners left bythe dififerent angles of the triangles. Laying Out a Hopper for a Coal Chute by the Methodof Triangulation. The hopper and chute to be laid ou are shown shaded inFig. I. The conditions are: that the mouth of the hopper shallbe round, 4 feet 6 inches diameter, that the distance on theside where the chute joins it should be 12 inches from theedge of the hopper to the chute, that the angle formed by thisintersection should be 90°, and that the after side of the hoppershould lay parallel with the chute, the chute to be round. I2inches in diameter. The practical considerations are how to lay out the hopperso as to make the least work in connecting the chute to it l82 LAYING OUT FOR BOILER MAKERS
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FI a, ( LAYOUT OF A HOPPER FOR A COAL CHUTE. MISCELLANEOUS PROBLEMS IN LAYING OUT 183 This may be done in several ways, but we shall make it asshown in the drawing with the joint parallel to the short sideof the hopper, so that the end of the chute which joins thehopper should be only a straight cut. By this method verylittle flanging will be required, and it can be easily riveted. In the accompanying illustrations it will be noted that similarfigures and letters denote similar joints or lines. Fig. I is a shaded view of the hopper and chute. Fig. 2 is a side view of same. Fig. 3 is a top or plan view of half the hopper. Fig. 4 is a view of half the end of the chute. Fig. 5 is a set of triangles, of which the lines a2, hs, C4, d5,e6, iy, g8, hg, Fig. 3, are the bases; these lines or distances aretaken from Fig. 3 and set off on the line P. R., Fig. 5, from thepoint P. The verticals of these triangles are taken from Fig.2, from the line M N (which is the upper edge of the hopper),downw
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