. Spons' dictionary of engineering, civil, mechanical, military, and naval; with technical terms in French, German, Italian, and Spanish . ^7~~~Jö:> «7 Involute of a ^UYáñ curve is generated by the end of a tangent to the circle made totouch the circumference in all its points successively. Let 0 A, Fig. 3149, be the radius of the given circle, and o the first point of contact of the GEAEING. 1627 tangents. Beginning at this point, mark on the circumference a sufficient number of equal , , , ..., to allow of each being considered as a straight line. Draw the
. Spons' dictionary of engineering, civil, mechanical, military, and naval; with technical terms in French, German, Italian, and Spanish . ^7~~~Jö:> «7 Involute of a ^UYáñ curve is generated by the end of a tangent to the circle made totouch the circumference in all its points successively. Let 0 A, Fig. 3149, be the radius of the given circle, and o the first point of contact of the GEAEING. 1627 tangents. Beginning at this point, mark on the circumference a sufficient number of equal , , , ..., to allow of each being considered as a straight line. Draw the tangentsfrom the points of division, and, upon the first, mark one of the elements or divisions of the circum-ference, lipon the second two of these elements, upon the third, three, &c. Join by a regular curvethe points 1, 2, 3, 4 ..., thus obtained. Elongated Involute of a Circle.—If at each of the points 1, 2, 3, 4 ..., Fig. 3149, we draw per-pendiculars to the tangents, and mark off on each of them a constant length, equal to o m, forexample, the points obtained, 6, c, (i, / . . belong to an elongated involute of a circle. Remarli.—The common involute may be wholly traced by the compasses, for any element g, 10has its centre at the point of intersection p of the tangents g, g, and 10, 10. The other curves, themeans of drawing which we have already given, may be obtained by means
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Keywords: ., bookcentury1800, bookdecade1870, bookidsp, booksubjectengineering
