THe mechanism is based on sliding-link mechanism ABC with slider 3 oscillating about fixed axis C. Added to thhis linkage is a double guiding element consisting of two sliders, 5 and 6, connected together by turning pair E. The mechanism is intended for tracing body and space centrodes of links 2 and 4. The tracing stylus is at the centre of pivot E. The mechanism is shown set up for tracing space centrode Cs. To trace body centrode Cb, sliding link 2 is secured to the fixed plane and link 4 is released. Centrodes of various shapes can be obtained by varying the lengths of links 1 and 4. This is accomplished by adjusting pivots B and C along slots F and G of links 1 and 4.
$1249$LG,Ge$