66 Remarks upon Bleaching. 
ut 
failed in their attempts to reach it, unrough the imperfection 
of boiling—often the reverse, because the heat will never 
exceed, and the moment it is exposed to the atmospheric 
air will fall below 212° Fahrenheit or boiling heat. But if 
the steam is confined, it is easy to raise its heat to 230° and 
then the effect upon the linen shows, in the most unequivo- 
cal manner, the advantages of augmented heat in bleaching.’ 
This effect is not only more strikingly obvious, but is singu- 
larly beautiful, when the goods are put in motion, and_ the 
degree of bleaching is rendered pertectly uniform... 
There can be no danger, as some have apprehended, of in- 
juring the linen by ive steam heat,b the scorching 
heat of steam is 520° Fah.—a pressure of fifty atmospheres 
or seven hundred and thirty five pounds upon a square inch 
—a pressure which no ordinary steam apparatus will resist. 
far soften soldering as to cause it to yield to the pressure, 
and the steam pipes will burst. These are facts which I 
state as the resi my own repeated experiments, in whi 
I cannot be materially mistaken, and therefore 
nts, in whic 
feel justified 
in saying, that | ; 
it is not possible with any ordinary workin 
