Home instruction for sheet metal workers . Fig 400. Fig. 401. angles require a valley bar, F, and the miter cut of the jackand common bars as in Figs. 400 and 401, a and b. The studentwill understand how these bars are developed with the aid of thequarter full size shop detail in Fig. 402 (see Folder 9). Fromthis the student is to develop his detail and the patterns full sizefor the model skylight in Fig. 403. In the shop detail in Fig. 402 the profiles of the ridge andcommon bars and the curb are the same as those used in theshop detail of the hipped skylight. As the principles in develop-ing
Home instruction for sheet metal workers . Fig 400. Fig. 401. angles require a valley bar, F, and the miter cut of the jackand common bars as in Figs. 400 and 401, a and b. The studentwill understand how these bars are developed with the aid of thequarter full size shop detail in Fig. 402 (see Folder 9). Fromthis the student is to develop his detail and the patterns full sizefor the model skylight in Fig. 403. In the shop detail in Fig. 402 the profiles of the ridge andcommon bars and the curb are the same as those used in theshop detail of the hipped skylight. As the principles in develop-ing the valley and jack bars are similar to those in the hip bar,this detail will be briefly described. As in the last exercise, thestudent should draw the pitch 1/3 or 8 to 12. Draw the centerline A B, at right angles to which from O draw the base line ofthe triangle, 12 in. long. Make the distance O C, 8 in. high, anddraw the hypotenuse C 12, which represents one-third the section of curb D in its proper position so that the cu
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1922
