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 394
Fig. 85. Fis. 86. … Fig. 87. Fig. 83. Fig. 89. Fig. 90. The pointed arch may be divided into two classes, those described fromtwo centres, and those described from four. Of the first class there arethree kinds, the equilateral, the lancet, and the obtuse. Tlie equilateral(fig. 89), is formed of two segments of a…
