The mechanical engineer's pocket-book. A reference-book of rules, tables, data, and formulæ, for the use of engineers, mechanics, and students (1910)
Kent, William, 1851-1918 · New York, J. Wiley & sons · leaf 102
dicular to A B. MakeB b equal in length to half the circumferenceof the circle. Divide B b and the semi-circum-ference into the same number of equal parts,say six. From each point of division 1, 2,3, etc., on the circumference draw lines to the centre C of the circle.Then draw \at perpendicular to… … Fig. 68. 54 GEOMETRICAL PROPOSITIONS. 57. Method of plotting angles without using a protractor. — The radius of a circle whose circumference is 360 is 57.3 (more accurately57.296). Striking a semicircle with a radius 57.3 by any scale, spacersset to 10 by the same scale will divide the arc into 18…
Mechanical engineering
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