The Portland daily press. [volume] (Portland, Me.) 1862-1921, 1871-08-25
HARRISON STEAM BOILER.

list That steam-generator of whatevt
form or material, must as paramount cond
ton, be abs outely secure from destructive e.
blossoms, even ,chen caieleSSly used.
I'D. That it must be constructed upon
system of series of uniform parts SIMPLE l
form, few in number, easily made, and east
put together or taken apart, and not OF cost
material.
So That its strength should in no respec
be dependent upon any system of stays O
braces, whereby the ineficiency or rupture G
one OF these braces or stays, could cause great
ly increased strain upon the others, thus en-
dangering the whole structure.
18th. That its parts shonld not be of grea
weight or size, thus permitting greater porta
bility and greater facility fer getting it into o
out of place. .r.,. . .
18Th. That it must have a principal of re
newal, allowing the easy displacement aud re
placement or interchange of any enc or more o
its parts, without disturbing or impairipg tb
material or workmanship of the remaining por
| tons of the structure.
9th. That a boiler, whether of large O
small dimensions, should have uniformly suol
elements Of strength as would render it alway
capable of safely sustaining many times great
er pressure than need ever be demanded of i
in practice, and that its safety should not b,
| impaired by corrOsiop, or the many othe
harmful influences, which 30 soon and so Sc
rously affect the strength of ordinary boilers
18th. That the parts should be SO made and
put together, that in case of rupture of any
portion OF the boiler no general break up of the
structure could occur, the release of the pres
sure by such rupture merely causing dis
charge of the contents, without explosion or
serious disturbance of any kind. .s
"Sth. That it should be constructed 50 as to
facilitate the certain removal of deposit from
its interior or exterior surface.
"These axioms being carried out,tIal else be-
ing equal, it is believed that the result must
be better and safer steam-generator than any
that has preceded it,
CONCLUSION
Considering the plan material, and mode OF
manufacture of the Harrison Boiler let us re-
vert to the d1iOms laid down as guiding prin-
ciples in making a steam boiler, and see how
far they have been carried ont.
1st The boiler under consideration is the.
oreticdlly and practically safe from all destruc-
tiue explosion, even when carelessiy used.
q. 1t is constructed upon a system or series
of uniform parts teao IN number, easily made,
and easily put together or taken apart, and not
of costly material.
81. Its strength is in no respect dependent up
on any system of stays or braces hereby the in
pficipOp7 oT 9,a,,1 af a.
stays can cause greatly increased strain upon
the others, thereby endangering the achole struc-
tire.
4th. Its parts are mo-. of great aoeight or size,
and may te easily transported, or put into or
be taken out of place.
9th. 1t has principle of reneaoal, alloaoing
the easy displacement and replacement or inter
change of any and all of its parts, acithout i'm
pairing or disturbing the material or aoorkma,s-
ship of portions not needing rene,cal.
9th. Whether of large or small size, it has
uniformly such elements Of strength, as acM al
aoays render 1t capable of sustaining many times
greater pressure than need be demanded of it IN
practice, and its safety is not impaired by coro-
sion, or the naany other harmful influences that
so soon and so seriously dfeca the strength of or
binary boilers
'7th. Its parts are so made and put together
that in case of rupture, no general break-atp can
occur. It's contents may be discharged, but no
explosion or serious disturbance of any kind can
take place, consequent upon such discharge;
Sth. 1t is constructed so as to facilitate the re-
moral of deposit of all kinds, from its interior
and exterior surface. a
1t is assumed that the better guiding prin-
ciples" in the construction of a steam-boiler
have been fairly carried out-that all other
matters are at least equal, and that the result
is a safer, if not better one than any that has
preceded it.