Johnston, Philip Devereux, 1855- · New York, D. Williams Company · leaf 110
radius draw arc C D, Make C Dequal to circumference of base B C, and draw A D.To lay out the envelope of a hexagonal pyramid:Fig. 39. Draw semi-circle on base B C and divide into three equal parts, B i, 1-2, 2 C. Draw i-i, 2-2,and make A 3 equal to height of pyramid. Draw A B,A i, A 2, A C,… … ^ F.a%9 K^ 2 C io6 A MANUAL OF MECHANICAL DRAWING. Plate 34. To Drazv a Hemispherical Dome and toDevelop in the Flat Sheet the Sections.Let C A D be the side elevation of the dome andE B F the plan. Divide the arc A C into any number of equal partsand draw lines through the points of division…
Mechanical drawing
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