Appletons' cyclopædia of technical drawing : embracing the principles of construction as applied to practical design ... (1896)
Worthen, W. E. (William Ezra), 1819-1897 · New York : D. Appleton · leaf 51
fix the other end to the focus F; slide the square steadily along thestraight-edge, holding the cord taut against the edge of the square by a pencil,D, and it will describe the curve. To construct a parabola when the vertex, the axis, and a point of the curveare given (Fig. 108). Let A be the… … parallels to the axis through 1 2 3. The intersection of the diagonals A 3,A 2, A 1 with the parallels 3, 2, 1 at G, F, E will be points in the requiredcurve. Extend the axis to B, making A B=A B; draw perpendiculars to the axisfrom G, F, E, D; lay off toward B, a=A. a, A £=A b, A c = A c; and…
Mechanical drawing
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