Johnston, Philip Devereux, 1855- · New York, D. Williams Company · leaf 112
J K equal to the arc A C,and through K draw a b at right angles to J K, makinga b equal to the arc 2, 3, and on it with K for centredraw semi-circle a j b, whose diamicter is equal to thelength of arc 2, 3. Divide this semi-circle into asmany equal parts as was the arc A C, and through thepoints of…
Mechanical drawing
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