Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ... draughtsmen .. (1897)
Willson, Frederick Newton, 1855-1939 · Princeton, N.J., The author · leaf 113
gth in the previous chapter: although a review of such luatter may be by no meansdisadvantageous to those who have already been over the fundamentals. 132 THEORETICAL AND PRACTICAL GRAPHICS. sujoposed to be smTdumled by a system of mutually-peqiendieular transparent ]ilanes, or, in otherwords, to… … iiPiii||l||[r|[i(B«p™R|^ pendicular from it to the j)lane. The whole sj^stem of box and planes, in the wood-cut, is rotated90° from the position shown in Fig. 228(a), liringing tliem into the usual position, in which theobserver is looking perpendicularly toward the vertical plane. ^igr- 22Q.
Mechanical drawing · Lettering
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