Nystrom, John W. (John William), 1824-1885 · Philadelphia, J.B. Lippincott · leaf 96
adii and tangents for eachpart, divide the pitch p into an equal numberof equal parts, then the first tangent will beone part, second two parts, third three parts,&c, and so the Evolute is traced. 45. To construct a spiral with compassesand four centres. Given the pitch of the spiral, construct… … 46. To construct a Parabola. Given the vertex A, axis x, and a point P.Draw A B at right angle to x, and B P parallelto a?, divide A B and B P into an equal num-ber of equal parts. From the vertex A drawlines to the divisions on B P, from the divi-sions onAB draw the ordinates parallel to x,the…
Mechanical engineering · Engineering
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