The carpenter and joiner's assistant : being a comprehensive treatise on the selection, preparation, and strength of materials, and the mechanical principles of framing, with their application in carpentry, joinery, and hand-railing : also, a course of instruction in practical geometry, geometrical lines, drawing, projection, and perspective : and an illustrated glossary of terms used in architecture and building (1860)
Newlands, James, 1813-1871 · Glasgow : Blackie and Son · leaf 42
h the points 1 2 draw lines E m, E k , cutting the prolongation of the minor axis in G, which will be the lines 1 B, 2 B, in m and 1c. Bisect k B by a perpendicular centre of the arc / D. The perpendicular h H raised on It, meeting E b produced in G: join k G. Bisect mk by a e f meets the line g G… … the major axis in m, which will be the centre of the arc half of the curve, will be obtained. A e. The three remaining quadrants of the ellipse are Problem XCVI. — The two axes ac, eb being given, easily constructed from the data thus obtained. to describe a still nearer approximation to the…
