Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ..draughtsmen .. . in which all the lines are isometric, with theexception of Dz and its parallels, and ST. The drawing of non-isometric lines will be treated in the next article, but assuming theobjects as given whose shadows weare about to construct, we may startwith any line, as Dz. The ray Dd is at 30°. Its pro-jection d^d is a horizontal through theplan of D. The raj and its projectionmeet at d. As the shadow beginswhere the line meets the plane, wehave z d f
Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ..draughtsmen .. . in which all the lines are isometric, with theexception of Dz and its parallels, and ST. The drawing of non-isometric lines will be treated in the next article, but assuming theobjects as given whose shadows weare about to construct, we may startwith any line, as Dz. The ray Dd is at 30°. Its pro-jection d^d is a horizontal through theplan of D. The raj and its projectionmeet at d. As the shadow beginswhere the line meets the plane, wehave z d for the shadow of D z. Thisgives the direction for the shadow ofany line parallel to D z, hence for yv,which, however, soon runs into theshadow of B C. As b is the intersec-tion of the ray B b with its projectionb-^b, it is the shadow of B, and bibthat of b^B. Then b v is parallel to B C, the line casting the shadi)W being j^rallel to the plane receiving it. In accordance with the principle last stated, de is equal and parallel to D E, and ef to EF. At / the shadow turns to g, as the ray f F, run back, cuts MG at /, and fG casts the /(
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Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
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Keywords: ., bookcentury1800, bookdecade1890, booksubjec, booksubjectlettering
