Forge-practice and heat treatment of steel by Bacon John Lord & Markham Edward Russell 1860-

Author:Bacon, John Lord & Markham, Edward Russell, 1860-
Language: eng
Format: epub
Tags: Blacksmithing, Forging
Publisher: New York, Wiley
Published: 1919-03-25T05:00:00+00:00

MISCELLANEOUS WORK.

211

desired. Fig. 265 shows an under-fired furnace, the gases entering at the bottom as shown. The gas and air uniting in the combustion chamber and rising to the roof, and are then forced down onto the floor of the furnace. In this particular furnace there are no walls extending up from the floor. If work is placed very near the edge, excessive heating of the portions nearest the rising gases is almost sure to result.

FIG. 265.

FIG. 266.

Fig. 266 shows a design identical with Fig. 265 except that upright walls are added, to prevent the undesirable results mentioned. The height of these walls is not material so long as they are high enough to prevent uneven heating, and yet not sufficiently high to prevent the gases flowing naturally into the chamber. If carried too high the gases are forced through the small openings at high velocity and impinge against the upper portions of pieces in the furnace heating them hotter than the balance, this is especially true of large pieces that extend up well toward Jjje roof.

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