Mechanical drawing; a treatise on the drawing of mechanical and machine details (1920)
Jones, Franklin Day, 1879-1967 · New York, The Industrial press; [etc., etc.] · leaf 274
e,while the third point describes the ellipse. Of course only GEOMETRICAL DRAWING PROBLEMS 261 one fourth of the ellipse is drawn at a time, and then it isnecessary to shift the position of the square. Construction of a Helix. — The helix, which is frequentlybut incorrectly referred to as a spiral,… … Fig. 5. Representing a Large Square Thread by drawing Accurate Helical Curves is divided into a number of equal parts. In this case thereare eight divisions as shown at the left-hand side of the illus-tration. One half the lead of the helix (the lead equals thedistance that the helix advances in…
Mechanical drawing
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