Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 40
and b ; move the angular point, c, mthe direction, a c b ; keeping the edges of the triangle hardagainst the pins, a and 6 ; a pencil held at c will describe thearc, a c b. If the angle formed by the rulers at c be a right angle, thesegment described will be a semi-circle. This problem is usefulin… … 26 AMERICAN HOUSE-CARPENTER. 88.— To describe the segment of a circle hy intersection of lines. Let a b, {Fig. 47,) be the chord, and c d the height of the segment. Through c, draw ef parallel to a b ; draw 6/at right angles to c b ; make c e equal to c /; draw a g and b h, at right angles to a b ;…
Carpentry · Architecture
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