The mechanism is based pn four-bar linkage ABCD. Added to this 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 the centrodes of links 2 and 4. The tracing stylus is at the centre of pivot E. In the shown position, the mechanism is set up for tracing space centrode Cs, i.e. for the case when pivots A and D are fixed. To trace body centrode Cb, pivots B and C are fixed and pivots A and D are released. The required centrodes can be obtained by varying the lengths of links 1, 2, 3 and 4. This is accomplished by adjust ing pivots B, C and D along slots F, G, H and K in links 1, 2, 3 and 4.
$1243$LG,Ge$