Sullivan, Christine [Gordon]. [from old catalog] · New York, Cincinnati [etc.] American book company · leaf 23
e center of agiven circle. Draw any two chords AB and ^C (Fig.25). Bisect these chords, and prolongthe bisecting lines. Where these meet,locate the required center. Problem 6. — To erect a perpendicular froma point without a given line. Let AB (Fig. 26) be the given line, and O thepoint. From (9 as… … *^^=T^.
Mechanical drawing
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