be the rolling circle onthe outer circumference of the direct-ing circle. Divide R-A into anynumber of equal parts (say 12), andlay off these parts on A.ab, etc.,giving points a, b, c, d, etc. With the centre of the directingcircle as a centre, draw an arc fromR giving the line of centres R123etc.… … 50 GEOMETRICAL PKOBLEMS. centres 1, 2, 3, etc. and radius RA draw the several positionsof tlie rollinof circle. With the centre of the directinfj circleas a centre, draw arcs through the points of division of the cir-cle R-A to meet the several.positions of the rolling circle inpoints C, D, E, F,…
Mechanical drawing
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