Bulletin No.12

Cover Bulletin No.12
Bulletin No.12
United States. Forest Service
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Attention should be called, however, to the fact that even theoreticians would hardly desire to call for a post much less than 9 by 9 inches on a trestle for support- ing heavy locomotives, even for very short posts, while the longer the post gets the more nearly the theoretical size will correspond to current practice, which is to use practically 12 by 12 inch sticks throughout.
The comparatively low height of trestle assumed by the author of the paper for demonstrating the case does not reall
...y represent a fair aver- age of the trestles in the country as far as the proportion of theoretical to actual sizes of posts is concerned. In other words, the grand aver- age of actual current work would show that the timber used for posts is closer to the theoretical requirements than in the example assumed for illustration.
The use of 12 by 12 inch stuff indiscriminately, while wasteful of timber in certain cases, is warranted by a great many practical features which absolutely control the situation and predominate far above theo- * The reviewer here and elsewhere has missed the main point made for the use of corhels as proposed, namely , that they as well as caps and sills be of oak or some similar hard wood, so that a smaller bearing area will yield twice the strength.


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