Practical mechanical drawing and machine design self taught .. (1907)
Westinghouse, Charles. [from old catalog] · Chicago, F. J. Drake & co. · leaf 59
raight line. Point F in Fig.129 is the focus, CD is the given straight linecalled the directrix, and AB, a perpendicular toCD through F, is the Axis V, the intersection ofthe axis with the curve, is the vertex, and it mustbe equidistant from the focus and the directrix, 56 MECHANICAL DRAWING Having… … Fig. 130. as center, intersecting line MN at points M and N.These are points in the parabola. Similarly obtainother points and draw the required curve. A tan- gent to the curve may be drawn at any point M bydrawing MO parallel to the axis and bisecting theangle OMF. MT is the required tangent at…
Mechanical drawing · Machine design
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