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. 1899 Excerpt: ...suit the special requirements of the class of work on which they are to be employed, yet in each case their function is precisely the same, viz., the conversion of a small force moving through a considerable space into a large force moving through a small space; and, further, we have seen that whereas, with the aid of ...
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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. 1899 Excerpt: ...suit the special requirements of the class of work on which they are to be employed, yet in each case their function is precisely the same, viz., the conversion of a small force moving through a considerable space into a large force moving through a small space; and, further, we have seen that whereas, with the aid of such machinery, two or three men can lift a load of ten, twenty, forty, or any other number of tons, yet no more is got out of the machines (but rather a little less) than the men themselves put into them. We cannot create power. A lifting machine merely receives power from some external source, and gives forth such power again in a somewhat different form; it has no power or force whatsoever within itself. The greater the load we require to lift with a given available force, the less will be the distance through which we can move the load in any given time. Unless we can increase our motive power, then, we can only increase the actual weight that can be lifted at the expense of the speed at which such weight will be raised. That gain of power in hand-power lifting machinery must always be accompanied by loss of speed, is one of the first lessons that the science of mechanics teaches ns: and it is surprising, therefore, to find how many very able and excellent men of business will altogether ignore this simple but unalterable law, when brought to consider the necessity of purchasing some sort of lifting appliance with which to equip their premises. They will study cheapness in cost price before efficiency, and will decide upon a machine that is, no doubt, of very low first cost, but which is also very frequently quite unadapted to efficiently perform the service required of it. There are at the present time to be met with in almost every town ...
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Add this copy of Notes On the Construction of Cranes and Lifting to cart. $16.27, new condition, Sold by Ingram Customer Returns Center rated 5.0 out of 5 stars, ships from NV, USA, published 2022 by Legare Street Press.
Add this copy of Notes On the Construction of Cranes and Lifting to cart. $27.44, new condition, Sold by Ingram Customer Returns Center rated 5.0 out of 5 stars, ships from NV, USA, published 2022 by Legare Street Press.