Kenison, Ervin, Gardner, Harry W, Lawrence, William Henry, 1868-, Everett, Herbert E. (Herbert Edward), 1863-1932, Gregg, D. A. (David A.), Von Holst, H. V. (Hermann Valentin), 1874-1955, Brown, Frank Chouteau, 1876-1947, Griffin, Charles Lewis, 1867-, Neubecker, William, 1864-, Zapf, Alfred E, American School (Lansing, Ill.) · Chicago, Ill. : [American School of Correspondence] · leaf 67
elix. Fig. 2 shows the construction. Draw two projections of the cylinder A B D C ; along any element, preferably one of the contour elements, A B or C D, lay off the pitch A E. Divide the circumference of the circle, which is the end view of the cylinder, into any number of equal parts, and number… … the point A No. 1. From point 2 on the circle draw a line parallel to A B, and from point 2 on A B draw a perpendicular to A B. The point, L, where the parallel line meets the perpen- dicular line, is one point on the projection of the helix. The points M, N, etc., are found in the same manner. A…
Mechanical drawing
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
