The Manufacture of Iron

The Manufacture of Iron

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1831 edition. Excerpt: ... crank over the centres. This they do by their momentum; and if it were not for the fly wheel, the engine would be liable to stop at the end of every stroke; that is, whenever the piston and the crank get to their lowest point ofdepression ortheirhighest point of elevation. At these points the power of the engine is nothing, as it has no leverage upon which to act in the crank. At the intermediate parts of the ascending and descending stroke the power varies, being the greatest at the half stroke, when the crank presents the longest lever to the connecting rod, and proportionably smaller as it approaches the top or bottom. This irregularity of power is common to all engines working with a crank, and they are all therefore provided with a fly wheel. But when, in addition to this unavoidable variation in the action of an engine, it has to perform work of an intermitting kind--to resist great and sudden strains, that come at intervals, and last for only a short time, the fly wheel becomes eminently useful. In engines of this description, therefore, it is made unusually large and heavy, weighing perhaps 8, 10 or 12 tons, and of the diameter of 16 feet, the weight being disposed as much at the circumference as is consistent with the strength of the wheel. The speed at which it is propelled is also very much greater than in ordinary cases, being 70, 80, and even 100 revolutions in the minute--so fast, that the spokes or radii of the wheel are sometimes not discernible. The momentum of such a mass of iron moving at so great a velocity, may readily be conceived to be tremendous, and to be a most effectual coadjutor to the engine in carrying it through sudden strains. Indeed, hardly any force that could be opposed to it would be sufficient to more

Product details

  • Paperback | 24 pages
  • 189 x 246 x 1mm | 64g
  • United States
  • English
  • black & white illustrations
  • 1236878450
  • 9781236878458