The Weekly Perrysburg journal. [volume] (Perrysburg, O. [Ohio]) 1861-1???, 1868-02-07
.QHIssnlltitie.l lHHI



AnJnN,artaut SERVES Of experimeats, to
asoertnsa lhe,o comparative eyapora.ibg
bowef of iron and steel bsslers, were lately
made by "a. sStuckeholE,n.at the rolling
mills IS. Ai6xsrm Fuak h E,bers, OF Hagen
Prussia. Tho two boilers were eacli five
feet in Aiametory aud "a feet long, con
strucfod % stand FIVE atmospberes over
prcssure. Ono was made Of wrought iiUn,
and the other Of aoft cast.etcel The thick
ncssof the sides Of the cyliadrica portions
of the tfonbDiler was O.50 Of au inch, and
of the cast ,steeh boiler was 033rof an inch.
Each boiler had heating euf6ce OF 293
so,ynfo feet. and " equare feet of grato
surface. Bothowere now, and had nov6r
been before hcated They were sotiialike
IN bfick WORK, one above the other, but
entirely separated by masonry the gaseous
prdddcts Of combustion passed through d
ainihe iue underneath the bpcr aud passed.
into tho salno chimney. al first both boil
ors,wero filed, and fires kept under them
for several days IN order TO dry tho brick
work, aftor which the fires were extin
guisled aud tho boilers emplied and clean
cd. Each boiler then received exactly 7l2l
cubic feet of feed water at 30 q, temper
nture; tho man holes were closed, aud the
water was heated to tho boiling point,
ngain the fires were put ont, and oil the
ashes and GOALS taken away. From this
point tile bodies were fired afresh, and fed
with weighed fuel tlie man holes hitherto
kept eiosed, we're now opened to allow the
steam TO escapes; and the firing 40 we'll reg
ulated by means Of dampcrs, that the ve-
locity of tho escaping sle0m--.moasurcd by
Lists, Velocimeter--- was, the same in oaeh
boiler The temperature Of the gasses from
the.Bre WAS measured, at q poiut six feet
from the rear end Of each boiler, 10y Gaunt-
lett's Pyromctor. aud found to vary from
3i0eHto $50 %. ro'1
After .consdming on each CRATE $3.50
pounds OF coal OF the same qualityutllo Gin.
Ilors of which werc burned over, aud over
ngain, tho fires put out, aud the man-I0Ios
closed. On the following day thetemanr
ing water of the boilers, showing q tenn
pcraturo OF 35 degrees c., was lot out
through the omptying tube, situated at the
lowest part of the boiler, and measured by
means of h hydrometcr adapted TO the tube
Tho iron boiler showed 3sT cubic feet, aud
the steel boiler 33l cubic feet Of the re.
maining fcsd.water. Therefore tho water
cvaporated in the iron boiler was 7l2-3eI
--325 cubic feet, or, 20,065 pounds; and
that eyapnrated in the steel boiler was
Tl2--33l--3sl cubic feet, or 1923 pounds.
Hence the evoporOting capacity was proved
10 be lT.20 per cont. in favor ot the stoeI
boiler One pound Of coal evaporated in
the iron boiler $3.50 pounds Of water, aud
the steel boiler 7,lG7 pounds of water
at 100 degrees q.
At the next trial tho whole operation
was performed in tho same manner, Gully
the velocity Of the escaping steam was less.
1t resulted in showing 1862 per cent. in
favor of the steel boiler. One pound of coal
evaporated in the iron boiler 5,S09 pounds,
and in the steel boiler zoos pounds of
water
These two experiments were verified In
the following mannor: To an equal guam.
tity oil feed-wster in each boiler und equal
volume OF q strong solution OF salt was
added After string the water f,r some
time, by means of long poles, and boiling
it with closed man hoes samples were
taken out for future analysis. On complet-
ing this experiment in which equal quan.
titles of fuel and water we're used, further
samples were taken out. The analysis OF
the samples by DR.. List, of Hagen, showed
that in tho iron boiler one quart of water
contained, before evaporation, d,627 gram
mes Of cholorido Of sodium, aud alter 1855;
in tho steel boiler one quart contained
431l grammeS before, and 1885 grammes
of saltaftor evaporation !. the iron boiler
lsst 33.76 quarts, and the steel boiler 40.Sl
Quarts Of water showing 20.85 per cent. in
favor of the latter. The average per cent.
ago OF these thrco experiments is 1924
per cent. in favor OF the steel boiler, which
il will be noted had shell 80 per cent
thinner than that of tho wiousht,iron
boiler,