Appleton's cyclopædia of drawing, designed as a textbook for the mechanic, architect, engineer, and surveyor (1866)
Worthen, William Ezra, 1819-1897, [from old catalog] ed, Appleton, firm, publishers, New York. (1866. D. Appleton & co.) [from old catalog] · New York, D. Appleton and company · leaf 84
to be divided at thecircumference into six equal parts. Find the angleat the centre for a hexagon, or G0°; draw any ra-dius B C, and set off by a protractor or otherwisethe angle at the centre C B D, equal to G0° ; thenthe interval C D is one side of the figure, or seg-ment of the circumference;… … THE TJSE OF THE J SQUARE AKD TRIANGLE IN THE CONSTRUCIION OF SOMEOF THE FOREGOING PROBLEMS. From the description of the T square it may be seen, that by slidingthe stock along two contiguous edges of the board, the left hand andbottom edges, any number of parallel and perpendicular lines may…
