Higbee, F. G · New York, John Wiley & Sons · leaf 122
ts of the surface areperpendicular. Therefore, lay offa line equal in length to the rightsection and erect perpendicularsto this line. If the distances be-tween these perpendiculars bemade to equal the distances be-tween the elements along the curveof the right section and the perpen-diculars be… … 112 ESSENTIALS OF DESCRIPTIVE GEOMETRY the base the distances 1-2, 2-3, 3-4, etc., equal and small enoughso that the chord of the arc is equal, practically, to the arc itself, and through these pointsdraw elements of the cylin-der. The last step, 11-12,may not be equal to theothers but this does…
Geometry, Descriptive
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