Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 143
prism in an uprightposition (Fig. 259). Lay down the ground line G- K and draw the axis of the prism S S\ De-scribe the hexagonal plan A B C D E F, as in the previous example. Fromeach of the angular points, A, B, etc., erect perpendiculars, and on one of theseperpendiculars set off A G-, the… … Fig. 259. are each equal to one half of H I, which enables us to draw the elevation with-out constructing the plan—a fact to be remembered in the drawing of nuts,bolt-heads, etc., in machine drawing. To form the projections of the same prism, supposing it to have teen movedround the point G in a…
Mechanical drawing
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