V = half length of curve after elongation,
d = half distance between points of suspension.” Omit the remainder of the paragraph.
— [211], omit the 6th and 7th lines, and in place of formula there given, use that on page [210], (as corrected,) V being the length of semi-curve as elongated by heat instead of by tension; the elongations, both by heat and tension, being found by table on page [193].
— [212], l. 2, for “510.69,” read “510.80,” which result, of course, runs through the whole example.
— [213] and [214]. The remarks under “Anchoring Masonry,” are evidently wrong throughout: 1st, the whole tension should be divided by two, instead of four, as half of the whole tension acts at each point of suspension; 2d, no reduction should be made for the direction of the pulling force. One half of the tension is 3,321,250 lbs.; which is resisted by a column of masonry of 3,321,250
160 = 20,758 cubic feet, or 20 × 20 × 52 feet, or by a mass 15 × 15 × 91 feet.
— [214], l. 6, for “561,527,” read “562,542.”
— [215], l. 14 from bottom, for “STIFFENING TOWERS,” read “STIFFENING TRUSSES.”
— [225], l. 14, for “194,” read “193.”
— [226], l. 3, for “see page [128],” read “see page [193].”
— [227], l. 4, for “detensional,” read “detrusional.”