Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 481
r G is fixed, by means of the adjusting-screw H. The method of application of the instrument isas follows:—Take a straight-edge T or T square, having previously drawn two lines at right anglesacross each other, for the major and minor axes of the required figure; place the bottom frame, with… … fix it. If the ellipsis required is the largest of the set, let the slide with the ball O be pushed out sofar as to bring the point of the pencil to the length of the major axis 11, the generating circle havingbeen turned round until the sliding-groove, with the ball O is parallel with the major…
Mechanical engineering
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