Science and art drawing : complete geometrical course ; consisting of plane and solid geometry, orthographic and isometric projection, projection of shadow's the principles of map projection, graphic arithmetic and graphic statics (1895)
Spanton, J. Humphrey (John Humphrey) · London : Macmillan · leaf 340
Fig. 132. Problem 103. To find the traces of Oj plane perpendicular to a given line.Pis. 133. … Let ah, ah, represent the projectionsof the given line. At any point / in ah draw the linefe perpendicular to it. Draw projectorsfrom / and e. Where the projector from/ meets ah in /, draw fe parallel toXY till it meets the projector from e inc. Through e draw the line cd at rightangles to ah. Prom…
Geometrical drawing
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