The Open Fireplace in All Ages
The Open Fireplace in All Ages
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Digitized by Google 104 THE OPEN FIREPLACE.
while the outer portions are very much finer. Outside of all a coating of silicate forms a thin skin comparatively imper\'ious, so that a furnace, which when new would resist every test, might prove to be quite useless as soon as the thin outer coatings were destroyed by heat and rust.
With wi-ought-iron these objections do not hold. The gas-pipe used in the experiment illustrated in Fig. 136 was of wrought-iron. As was to be expected, no mercury pass...ed through it under the greatest pressure then applied.
Wrought-iron is, however, more quickly burnt out than cast-iron. But the diflferenee is not important, especially where fire-clay linings arc used and proper care is taken in its management.
What will happen to iron in a red-hot condition seems to me to be entirely of minor importance. The matter is almost wholly dependent upon the quality of the castings used.
To obtain castings which, in the cold state, will allow no gas to pass through under greater or loss pressure, either when new or after a little use, I believe to be difficult, if not impossible, as furnaces are now made, and at best always a matter of chance.
What to read after The Open Fireplace in All Ages?
You can find similar books in the "Read Also" column, or choose other free books by Putnam, John Pickering, 1847-1917. [from Old Catalog] to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Digitized by Google 104 THE OPEN FIREPLACE.
while the outer portions are very much finer. Outside of all a coating of silicate forms a thin skin comparatively imper\'ious, so that a furnace, which when new would resist every test, might prove to be quite useless as soon as the thin outer coatings were destroyed by heat and rust.
With wi-ought-iron these objections do not hold. The gas-pipe used in the experiment illustrated in Fig. 136 was of wrought-iron. As was to be expected, no mercury pass...ed through it under the greatest pressure then applied.
Wrought-iron is, however, more quickly burnt out than cast-iron. But the diflferenee is not important, especially where fire-clay linings arc used and proper care is taken in its management.
What will happen to iron in a red-hot condition seems to me to be entirely of minor importance. The matter is almost wholly dependent upon the quality of the castings used.
To obtain castings which, in the cold state, will allow no gas to pass through under greater or loss pressure, either when new or after a little use, I believe to be difficult, if not impossible, as furnaces are now made, and at best always a matter of chance.
What to read after The Open Fireplace in All Ages?
You can find similar books in the "Read Also" column, or choose other free books by Putnam, John Pickering, 1847-1917. [from Old Catalog] to read onlineMoreLess
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