New-York daily tribune. [volume] (New-York [N.Y.]) 1842-1866, 1857-03-24

visiting fue, ebout fory cabc msres srs effective; the
other hall Is us.less. IG order TO determine tie smaust
Of entering through the wicdo JOINTS. 4r. Grssa
employed an isgebious method will de,cdoe It, -
il lie the first attempt thst wse made TO hsce The
p'oRress OF a current OF cir through room Mr..
Grsssi made email tole in ore c. the wndowfrsme',
al in vsrou directions from this hole he placed snsd
strips Of white paper iDpreenated with acetate OF eao
he tn placed on the outeide o. the window uphdr"
ted hydrogen gss, the meet part OF which was i'st
the atm0 phere; a poruoo, bo~ever, was, toge'nei
with the air drawn Tito tue room BY tie effect OF 'he
yeptla,ing apparatus. The air thus mixed WHO SUI
pbuietted hydrogen, when passing over the paper
strips containing the tal Of lead blaciened them 'nus
leaving trace Of its progress. In few minutes
was seen thai the email strips were chieny saae IN
,be direction from the window TO the opening Of the
yebtilatpg chimney. This fact once established, Mr.
Grassi then made experiments with both systems OF
ventilation to ASCERTAIN wtico one would enable him
best to change completely the entire quality Of
air in room containing about $50 cubic metres.
To this end he employ ed the following method: The
rgress and egress openings OF the apparatus having
been shut, certain quantity Of aromatic vinegar
poured on red hot shovel The room WAS iumed.
atsly filled With the perfdmed vaporo; all the
sting fpts were then opened and ventilation by irec
ton established To drive the odor completely out Of
the room it took about 40 minutes during Which time
900 cubic metres Of cir entered the loom Tne fues
were shut again; a like quantity Of aromatic vapor
was produced and ventilation by suction took place.
tte same quckness Of motion beiog impaired TO the
veDtIator as be ore; IS minutes were necessary to
free the room from the odo and $50 cubic of
air were carried # from the room according to the TO-
strumsIts employed for measuring the quantities of air
discharged On comparing the results of both expert
meDts it shows tnat 900 cubic meters Of air scted
into the and p,sIg through the central part OF
il, gave the result az $50 cubic meters Of air
dra wD off by suction, which came into the parity
through the center, partly through the wiudo~ joints
Out OF the AZ cubic meters of the expelled air. about
500 meters entered through the stoves, and $50
through other accidental inlsts. The air coming
through the stoves, therefore, yielded almost the
whole effective arnount-the rest $50 cubic meters
was lost. We may further add that in mines where
ventilation is Of 30 much consequence, and where all
the various syst have been tried, fan.blowers to
force the air into the pits have been found the most
efficient. The apparatus of DR.. Van Hecke requires
very little power and is very cheap. The room at
BeapjOn Hospital where the new warming and
tlstu process has been applied, requires exactly the
same quantity of fuel as adjoining room which is
warmed by stove. Before the installation of the
steam engine in that hospital, the kitchen furnaces for
the supply of hot water daily consumed sc kog of
coal; at present the whole amount of fuel consumed Is
20 klog. The engine only occasions increase of "a
klog. Of fuel or daily expense of "a confines for
each patient.