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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1884 Excerpt: ...is 300 x 300 feet, which is 90,000 feet. The square of the chord or span (8 feet) is 8x8 feet, which is 64 feet, which, subtracted from-the square of the diameter, leaves 89,936 remainder, the square root of which is 299.893+, which, subtracted from the diameter (300 feet), leaves.107 remainder, half of which gives.0535 feet as the rise, which we multiply by 12 to get the number of inches, which gives.642 inches. By referring to our table of decimal parts of an inch with fractional equivalents, we find that this is practically f of an inch rise. Now, knowing the rise, and the chord or span, .we can describe the curve by means of the frame arrangement described in Plate 3, Fig. 8. Descriptions and Uses of the Various Markings on Rules and Squares, including the Slide-rule, and hoiv to use it.--Although the markings on rules and squares were made for the express convenience of workmen, yet but very few understand the uses of them. Every workman ought to be perfectly familiar with all of them, so as to avail himself of every advantage they afford. On Plate 37 will be found illustrations of the most important markings. Fig. 93 is the board-measure commonly found on the back of the blade of ordinary 2-foot squares. To find the number of square feet in a board, find the number representing the length of the board in feet in the column under 12 inches, then in the same line find the number of square feet under the number of inches in width. For instance: Suppose a board is 14 feet long, and 6 inches wide, in the column under 12 inches we find 14, the length of the board in feet: then on the same line, under 6 inches (the width), we find 7, which is the number of square feet contained in the board. Again, suppose the board is 8 feet long, and 5 wide, under 12 inches..

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