The mechanism is based on crossed-crank linkage ABCD. Added to this linkage is a double guiding element consisting of two sliders, 5 and. 6, connected together by turning pair E. Links 1 and 3 have wheels 7 and 8 with sharp-edged rims. The mechanismis intended for tracing roulettes of ellipses. For this purpose, a stylus at the centre of pivot E is placed on the curve with respect to which the roulette of an ellipse is to be obtained. Wheels 7 and 8 are set on a plane table. When the stylus of pivot E is moved along the above-mentioned curve so that wheels 7 and 8 roll along the plane table, any point of plane member H, at tached to link 4, describes the corresponding roulette of an ellipse. The mechanism is set up for various ellipses by adjusting pivots B, C and D along the corresponding slots in links 1, 2, 3 and 4.
$1251$LG,Ge$