Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 169
or bolt, thehand rail on a spiral stair,etc. Another type of helix canbe generatedby a pointmoving on thesurface of acone, follow-ing the same■laws as above.Such a curve is called a conical helix. Its hori-zontal projection is a spiral of Archimedes.(See § 136.) EXERCISE SHEET XUX [Note. Each of… … (irf^ y//^/^ ^J 3r Fig. 148 VII, § 137] CURVED LINES 151 When the door is cpaned, the point h moves outward and upward asindicated by the arrow h, while the roller moves directly upward, incontact with the wall, as shown by the arrow r. Determine the exactlimits of the space not interfered with by…
Geometry, Descriptive
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