tee = "08 the Rapid Production of Steam: 309 
1582 pounds _exclusive of any al- 
ouble thickness at the joints. The 
r flu mage bes pounds. As the fire 
alf of the outer shell, ie on hole of 
1e there would, in case of the heeling of a boat, su iently to 
throw all the water out of one boiler, be no less than 636 ee 1427 
pounds of iron exposed to the direct action of the fire, pie liable to 
“become red hot. By the first series of experiments detailed in the 
paper above alluded to, (page 296,) we see that one pound of at- 
mospheric steam be generated from water at 212° by every 
nine pounds of j iron, ata low red heat, in day light ; consequently, the 
27 
‘metal above supposed * be sufficient to produce Ye == 1583 
Ibs, of steam from water at 212°, whenever a change of position 
should favor its influx in sufficient quantity to cover, either by actual 
submersion, or by violent agitation, the surfaces of the flue and lower 
arch of the boiler. ‘To calculate the effect of this weight of vapor, 
oa . interior capacity of the latter is but 82.4 cubic feet ; but 
the condition of things now supposed, a — part ‘ r i 
“Space is occupied by water. 
The bulk of steam becomes known by ‘titan its + ipatihe 
‘gravity with that of the water from which it is formed. ‘Thus, as- 
suming the specific gravity of common air, at 60° Fah. to be .00122 
of that of water at the same temperature, as determined by Biot & 
Arago, the specific gravity of steam compared with air at 60° being: 
481 to 1, the specific gravity of steam compared with water at that 
158.5 
"62,5 = 2: 536-cubic feet, the atmospheric steam, which can be ob- 
tained from it will be=2.536-~.00058682=4321 cubic feet ; which, 
| 2 
, divided by the capacity of the boiler, gives ~g5 j= 525924 
; nearly, for the number of atmospheres of pressure, supposing the 
Whole to be condensed and confined in the single boiler, within 
which we have shown that it may be generated. This would give 
786 Ibs. to the square inch. But upon the supposition that dilifle 
heat continues to be applied to the boiler, from which the water is 
drained, its connexion with others remains uninterrupted, nearly the 
usual pressure will be maintaines within it. This pressure may be 
= You. XX.—Né. 2: 40 
seats + Se 
at a, 
me Peat 
- alae = * ‘ai cae > 
ws 
we must compare its bulk with the steam-room left in the boiler. — 
; temperature, is -00058682. As 1584 Ibs. of water at 60° measure 
Pe 
