With air not heated and coke; 7;3 1/4; 15; 45
2. With air heated and coke; 4 3/4; 3 1/4; 10; 60
3. With air heated and coals not coked; 2 1/4; 3 1/4; 7 1/2; 65
Notes. 1. To the coals stated in the second and third lines, must
be added 5 cwt of small coals, required to heat the air.
2. The expense of the apparatus for applying the heated air
will be from L200 to L300 per furnace.
3. No coals are now coked at the Clyde iron works; at all the
three furnaces the iron is smelted with coals.
4. The three furnaces are blown by a double-powered
steam-engine, with a steam cylinder 40 inches in diameter, and a
blowing cylinder 80 inches in diameter, which compresses the air
so as to carry 2 1/2 lbs per square inch. There are two tuyeres
to each furnace. The muzzles of the blowpipes are 3 inches in
diameter.
5. The air heated to upwards of 600 degrees of Fahrenheit.
It will melt lead at the distance of three inches from the
orifice through which it issues from the pipe.
289. The increased effect produced by thus heating the air is
by no means an obvious result; and an analysis of its action will
lead to some curious views respecting the future application of
machinery for blowing furnaces.
Pages:
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321