Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ..draughtsmen .. . Xig-. *By the deflnitlon of a surface of revolution (Art. 340) any point on it can generate a circle about its axis. If, then, twosurfaces have the same axi^t any point common to both surfaces Tvould generate one ancl the same circle, which must also lieon both surfaces and therefore be their line of intersection. THE INTERSECTION OF SINGLE CURVED SURFACES. 169 h! \9 Xig- ESS.

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Keywords: ., bookcentury1800, bookdecade1890, booksubjec, booksubjectlettering