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The Locomotive, 1899, Vol. 20 (Classic Reprint)

The Locomotive, 1899, Vol. 20 (Classic Reprint)

137927362
1175 руб.
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Описание
Excerpt from The Locomotive, 1899, Vol. 20

Formulae are indeed given for designing them, in various books; but a formula is usually regarded by a mechanic either with a feeling akin to terror, or with a certain distrust of his own ability to apply it correctly, owing to the fact that his education and experience have not familiarized him with mathematical modes of expression. Brief tables giving the strengths of hooks that have certain special forms of cross-section may be found here and there, but while these tables constitute a step in the right direction (since they make the results of the formulae more readily available), they are not of any great service to the boiler-maker who does not wish, if he can avoid it, to go to the expense of forging the hooks up into the special form of section upon which the tables are based, and for which alone they were computed.

When these facts are considered, it is not strange that the hooks that are met with in practice are often smaller than they ought to be. We had occasion, a short time ago, to criticise the size of some of the hanger-hooks that were sent out by a certain boiler-manufacturer, who makes good boilers and means to do the right thing. His reply is before us as we write, and he gives figures intended to justify his hooks, and to show that they are amply strong but he bases his calculations on the size of the iron of which the hanger is made, and makes no allowance whatever for the weakness in the hook itself, due to its form. As we have said, we are confident that this man means to do the right thing, and that his trouble is, that he does not know how the stresses in a hook are distributed.

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