rob. 106. To construct an interior epicycloid. N \ Let the circle A-C roll on B-CMN. On the circumference of B-C lay offequal arcs CM, MN, NO, etc. Drawfrom M, N, 0, etc. radial linesthrough B, and make MD, NE, OFeach equal to the radius CA. Withcentres D, E, F, etc. draw the cir-cles tangent at M,… … Prob. 107. To draw a scroll for a stair-railing. The circle ABCD is the eye of the scroll.Draw the diameters AC and BD at rightangles. Draw the chord AD, and bisectit in 6. Draw a line 65 parallel to AC.Bisect AE in F. Bisect EF in 3. MakeE4 equal to E3. Draw 32 and 45 paral-lel to BD, and 21…
Mechanical drawing
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