The lengths of the links comply with the condition: D͞C:E͞B=A͞D:A͞E. Points A, C and B lie on straight line Aa. Thus links 1, 2, 3, 4, 5 and 6 constitute a pantograph. The forked end of link 1 can turn about pivot A both in the plane of the drawing and in a plane perpendicular to the drawing. Points C and B describe similar three-dimensional motions. Bevel gears 7, 8, 9 and 10 rotate objects b and c that are being copied.
$1447$LG,P$