elliptograph

Updated: May 21, 2025

This inference is so far correct, but the very common impression that the middle point of the rod always describes an ellipse is quite erroneous. The variation from that curve, while not conspicuous in all cases, is nevertheless quite sufficient to prevent the use of this movement for an elliptograph. To this there is, abstractly, one exception.

Various - Scientific American Supplement, No. 595, May 28, 1887