Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ..draughtsmen .. . * In the iuterest of compactness the Fii-st Angle position of the views is ;employe(l in Figs. 250, 253 and THE DEVELOPMEST OF SURFACES. 153 417. The development of an oblique The development will evidently consist of a series oftriangles having a common vertex. To ascertaintlie length of any edge we may carry it into orparallel to a plane of projection. Thus in Fig. theedge vb is carried into the vertical jjlane at vh. Itstrue le
Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ..draughtsmen .. . * In the iuterest of compactness the Fii-st Angle position of the views is ;employe(l in Figs. 250, 253 and THE DEVELOPMEST OF SURFACES. 153 417. The development of an oblique The development will evidently consist of a series oftriangles having a common vertex. To ascertaintlie length of any edge we may carry it into orparallel to a plane of projection. Thus in Fig. theedge vb is carried into the vertical jjlane at vh. Itstrue length is evidently the hypothenuse of a right-angled triangle of base o /j = n J, and altitude v Fig. 253 a pj^ramid is shown in plan andelevation. Making V c tolength 0 a = v a we have(?(( for the actuallengtli of edge va, aconstruction in strict>^ analogy to that ofFig. 252. The ])lanV b being jjarallel tothe base line showsthat vb is theactual length of thatedge. By carryingvci, where it becomes parallel to V, and then projecting Cj toof edge vc. xlg-- sss. Eig-. 2S2.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjec, booksubjectlettering
