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the valve can be borne with perfect safety -
therefore, if safety valve be loaded with 10 lbs


to the square inch, the pressure Of the steam can
be more than doubled before an explosion can
lensue.


The next greatest and almost only remaining


cause OF the explosion of steam boilers, is inaen-


ton in feeding with water. Though termed a
cause, it is most generally consequence or ef-
feet of the former. If the safety valve be too
heavily loaded great quantity of the water in
the boiler is converted into steam, which,
wherever it is in cont CT tends to heat the boiler
as much within as the fire does without; conse-
quently, an unusual motion of the boat by the
heave OF the sea- simultaneous movement of the
passengers from side to side, or any other circum-
stance, causes the water within the boiler to run
against the intensely heated metal, when gas
more powerful than steam itsefis nstantaneousy
evolved, and an explosion inevitably ensues.


Besides the guage cocks, some of the English
steamers have float attached to each boiler,
which by indicating the exact height of water in
the boiler proves great additional safeguard.


The American steam engines are in some re-
spects superior to the English-for instance, in
length Of stroke, by which greater speed IS at
tanned with equal power. The length OF the
cylinder should be twice that ofits diameter, which
is very nearly the proportion of the U. s. steamer
Fulton. The Great Western, with 22 inches
more Of diameter, has only l l-6 in length OF
stroke. The Fulton is, in smooth water, the
fastest boat, and in almost all respects, save It's
position, her machinery is the best.