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Carpentry and contracting Volume 2; a practical reference work on carpentry, building superintendence, etc - Softcover
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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. 1919 Excerpt: ...the cone obliquely. To find points on the curve in plan take a series of horizontal planes xyz, etc., between points c and d. One of these planes, as w, should be taken through the center of cd. The points c and d must be points on the curve, since the plane cuts the two contour elements at these points. Contour elements are those forming the outline. The horizontal projections of the contour elements will be found in a horizontal line passing through the center of the base; hence the horizontal projection of c and d will be found on this center line, and will be the extreme ends of the curve. The plane x cuts the surface of the cone in a circle, as it is parallel to the base, and the diameter of the circle is the distance between the points where x crosses the two contour elements. This circle, lettered x on the plan, has its center at the horizontal projection of the apex. The circle x and the curve cut by the plane are both on the surface of the cone, and their vertical projections intersect at the points 2-2. Point 2 on the elevation then represents two points which are shown in plan directly above on the circle x, and are points on the required intersection. Planes y and z, and as manj more as may be necessary to determine the curve accurately, are used in the same way. The curve found is an ellipse. The student will readily see that the true size of this ellipse is not shown in Fig. 139. Ellipse--Section from a Cone the plan, for the plane containing the curve is not parallel to the horizontal. In order to find the actual size of the ellipse, it is necessary to place Z' its plane in a position parallel either to the vertical or to the horizontal. The actual length of the long diameter of the ellipse must be shown in elevation, cvd", because the l...
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- VerlagRareBooksClub.com
- Erscheinungsdatum2012
- ISBN 10 113071117X
- ISBN 13 9781130711172
- EinbandTapa blanda
- SpracheEnglisch
- Anzahl der Seiten96
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