First principles of mechanical and engineering drawing (1897)
Holt-Butterfill, H · London : Chapman & Hall · leaf 187
say afrustum—then the lines of intersection of the two may be got in twoways. If the apex of the cone is accessible, the method already explainedwould be the simplest and best; but if the taper of the cone be onlyslight, and its apex out of reach or at an inconvenient distance, then theprocedure… … MECHANICAL AND ENGINEERING DRAWING 175 drawn in the plan and elevation of the solids as if entire, to findtheir lines of intersection divergent planes are assumed to cut throughboth, as in the last case; but to ensure that the planes used will passthrough the apex of the cone—of which the frustum…
Mechanical drawing
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