Hasluck, Paul N. (Paul Nooncree), 1854-1931, ed · Philadelphia, D. McKay · leaf 285
, these being plans of generators of theconoidal surfaces which are shown by theconventional view (Fig. 866). Projectorshave not been drawn for the right-hand halfof the plan, as this is exactly the same as theleft-hand half. From points 1 to 7 in theelevation draw the elevation of the generators… … Fig. 861.—Elevation of Circle-on-Circle Opening, with Soffit converging at the Springing and level at the Crown.
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