The mechanical engineer's pocket-book. A reference-book of rules, tables, data, and formulæ, for the use of engineers, mechanics, and students (1910)
Kent, William, 1851-1918 · New York, J. Wiley & sons · leaf 99
n a bperpendicular to it, meeting the axis at b. Set off A e, A F, each equal toB b; and draw K eL perpendicular to the axis. Then KL is the directrixand F is the focus. Through F and any number of points, o, o, etc., in theaxis, draw double ordinates, n o n, etc., and from the centre F, with… … dcbaBabcdFig. 57. straight-edge to the directrix E N,and apply to it a square LEG.Fasten to the end G one end of athread or cord equal in length to theedge E G, and attach the other endto the focus F; slide the square alongthe straight-edge, holding the cordtaut against the edge of the squareby a…
Mechanical engineering
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