Home instruction for sheet metal workers . pointon the outer arc as O2, draw a line to the center R, crossing theinner arc at 1°. Starting from 1° in the pattern for C, lay offon the inner arc four times the girth of the quarter section N° G,from 1° to 7 to 1 to 7 to N2. From R draw a radial line through Construction and Patterns of a Ten-Inch Ball 363 N2, intersecting the outer arc at O1. Then O1 O2 1° N2 will bethe pattern for flare C, two of which are required, allowing edgesfor soldering, as indicated by the dotted line. When striking the pat-tern for flare D the beamcompasses in Fig. 28sh
Home instruction for sheet metal workers . pointon the outer arc as O2, draw a line to the center R, crossing theinner arc at 1°. Starting from 1° in the pattern for C, lay offon the inner arc four times the girth of the quarter section N° G,from 1° to 7 to 1 to 7 to N2. From R draw a radial line through Construction and Patterns of a Ten-Inch Ball 363 N2, intersecting the outer arc at O1. Then O1 O2 1° N2 will bethe pattern for flare C, two of which are required, allowing edgesfor soldering, as indicated by the dotted line. When striking the pat-tern for flare D the beamcompasses in Fig. 28should be employed. If,however, none is handy, aV-shaped metal trammelcan be quickly made in theshop as in Fig. 519, bent asshown by A B, each sideabout 1 in. high. In thebend of the trammel prickmarks are made at S, Oand J to correspond to theradii S, O and J, Fig. a scratch awl at S,Fig. 519, as center, andanother at O and J, thearcs C D and E F area trammel has been made aspattern for flare D, Fig. 518,at the extreme right. Fig. 522. Forming Rolls. IB drawn. Assuming that suchexplained, then to obtain theuse S O and S J as radii, and with Sas center, draw arcs O1 O3 and J1 H K G in elevation represents thequarter section on the line H J, and arcJ1 lv represents the pattern cut on thisline (H J), then starting at any pointon arc J1 lv as lv, lay off four timesthe girth of the quadrant H K from lvto 7 to 1 to 7 to J1, and from points lvand J1, draw radial lines to the centerS1, intersecting the inner arc O3, O1 atO3 and O1. Then will O3 lv J1 O1 bethe pattern for flare D, two of whichwill be required, allowing edges forsoldering. This completes all the pat-terns required for the sphere, and it makes no difference whatsize the sphere may be, the same principle applies. When cutting these patterns or flares care should be taken toavoid waste in material by placing the patterns on the sheet as D D B Fig. Flares Rolled andSoldered Previous to Raising. 364
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1922
