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 wi th sharp-edged rims. The mechanism is intended for tracing the roulettes of hyperbolas. For this purpose, a stylus at the centre of pivot E is placed on the curve with respect to which the roulette of a hyperbola is to be obtained. Wheels 7 and 8 are set on a plane table. When stylus 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 a hyperbola. The mechanism is set up for various hyperbolas by adjusting pivots B, C and D along the corresponding slots in links 1, 2, 3 and 4.
$1252$LG,Ge$