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 272
en, with D as a center, describe GEOMETRICAL DRAWING PROBLEMS 259 the arc EF. Point H is next located midway between A andF and a perpendicular line EL is drawn, thus locating pointsK and L. From these two centers, the large and small arcsfor forming one half of the approximate ellipse are… … Fig. 3. Straightedge or Trammel Method of drawing an Ellipse — The Ellipsograph part of Fig. 3, is accurate and illustrates the principle govern-ing the operation of the ellipsograph shown in the same illus-tration. On a straightedge, which may be made of a strip ofstiff drawing paper, three lines,…
Mechanical drawing
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