. Cyclopedia of architecture, carpentry, and building : a general reference work .... -J/ Fig. .33. connected as shown. These dotted lines represent the bases of thesections whose altitudes are equal to similar numbers in the varioussections. • In order that the student may thoroughly understand thismethod of triangulation ^s well as sitiiilar methods that will follow 99 40 SHEET-METAL WORK in other problems, the model in Fig. 34 has been prepared, whiolishows a perspective of Fig. 83 with the sections bent up in theirproper positions. This view is taken on the arrow line in Fig. 33,the letter
. Cyclopedia of architecture, carpentry, and building : a general reference work .... -J/ Fig. .33. connected as shown. These dotted lines represent the bases of thesections whose altitudes are equal to similar numbers in the varioussections. • In order that the student may thoroughly understand thismethod of triangulation ^s well as sitiiilar methods that will follow 99 40 SHEET-METAL WORK in other problems, the model in Fig. 34 has been prepared, whiolishows a perspective of Fig. 83 with the sections bent up in theirproper positions. This view is taken on the arrow line in Fig. 33,the letters and figures in both views being similar. For the truesections on the dotted lines in C E A B in Fig. 33, take the lengthsof the dotted lines C E, E 7, 7 4, etc, and i^laee them on thehorizontal line in Fig. 35 as shown by similar letters and these small figures, at right angles to the horizontal line,erect the vertical heights C 8, E 3, 7 7, etc., equal to similar. i i / »> ^ 4 — —, »». ^^ 3 ?V N S > \ Fig- 34. vertical heights in the sections in Fig. 33. Connect these pointsin Fig. 35 by dotted lines as shown, which are the desired timedistances. Tn Fig. 36 are shown the true sectiojis on doiied linos inG E H F in Fig. 33, which are obtained in precisely the samemanner, the only difference being that one section is placed insideof another in Fig. 36. For the imttern proceed as is shown inFig. 37. Draw any vertical line as Gr F equal to G F in Fig. 33,With radius equal to G 1 and with G in Fig. 37 as center describethe arc 1, which intersect by aa axo struck from F as center and 100 SHEET-METAL WORK 41 with a radius equal to F 1 in Fig. 36. Now with F 11 in Fig. 33 asradius and F in Fig. 37 as center, describe the arc 11, which isintersected by an arc struck from 1 as center and with 1-11 inFig 36 as radius. Proceed in this manner until the line 3-9in Fig. 37 has been obtained. Then using 8-9 in Fig. 33 asradius and 9 in Fig. 37 a
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