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Richey's guide and assistant for carpenters and mechanics : a work of practical information, giving almost every geometrical and practical problem likely to arise in the work of the carpenter, and quick and easy methods for their solution : the use of the steel square, etc., tables showing strength and weight of materials, methods of framing, useful recipes, etc., etc. (1894)

Richey, H. G. (Harry Grant), b. 1868 · New York : W.T. Comstock · leaf 83

An illustration from Richey's guide and assistant for carpenters and mechanics : a work of practical information, giving almost every geometrical and practical problem likely to arise in the work of the carpenter, and quick and easy methods for their solution : the use of the steel square, etc., tables showing strength and weight of materials, methods of framing, useful recipes, etc., etc., 1894, leaf 83
95—To Describe the Involute of a Circle.—Dividethe given circle, Fig. 102, into any number of equal spaces,as I, 2, 3, etc.; draw a line from 2 tangent to the circleand equal in length to the arc i 2; draw line from 3 tan-gent to the circle and equal in length to the arc 3 i. Re- 76 GUIDE AND… … FOR CARPENTERS AND MECHANICS. 17 96—Lancet Gothic Arch.—A lancet Gothic arch isone whose radius is greater than its width, as shown inFig. 103. j^^- f.6»:r_.

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