Deseret evening news. [volume] (Great Salt Lake City [Utah]) 1867-1920, 1894-04-25
VENTIhHTION.-A
~o@

Tor tho egross Of foul; while O means Of
! moving these great masses VI air mus
Z be provided. Most systems Of ventiit.
ton depend upon cunugts OF tcmpsfa-
I lure 10 effect tho moving Of tue air
| tody, or upon some mechanical con.
tfivsnce, such ns fans, either 10 drive
3 air iut0 thu rooms, thereby forcing out
that already there, OF By drawing air
rom tho rooms, thereby tending Co
create n vacuum, Ia consequence Of
which other ar Will enter. Any 20 itco
Ufheat Ia room viii cause disturb.
anco Of the air, producing currents.
In general the tendency OF the warm.
or air viii be 20 rise; then the cold air
must fall In some other part Of The
room 20 restore the equilibrium. Ar
Ia contact with the cold walls OF vim
dove, becoming specifically heavier
because Of iia contraction ia hulk
through cold, viii sink, and the pres.
oncc Of such downward currents I'M
der these conditions may be- shown by
holding n lighted candle near the Wal
or wlniow. An exec lent method %
producing an up.cast current whereby
ioui air may br removed from ro0ms, is
by constructing veuti.nuug ulu
aiongeidu tue heating Hue. Toe
warmth from tho latter will cause the
ascent OF the DIR in tue yontilating
llut, air from tho rooms may then 10
mauo 10 enter, % openings from the
rooms into The dues uo properly
sffaugud. Such openings should be-
provided with registers whereby the
How inward may DO controlled. An
objection 90 the use ot such huc8 uas
teen urged ia the p0ssihllity of back
cuffonts, whereby smuku may be
drawn downward from the top VI the
adjacent lire Hue into the rooms. To
obviatc such difficulty automatic
valves should be- used in connection
with the registers. A simple form OF
such valve IL sheet VI oiled siIk OF
Of thin oil cloth, hung inside tue Hue,
fastened ht the tor, covering tue rug'
ittur opening. Such sheet Will yiulu
g. any pressure if0m the room toward
the Hue, but any current iu the opposite
direction will close the Hap against the
val. The Arn0t valve D. C1uaimCteI
10 work ON tho same principle, this
consists 0f sheet VI metal hinged
delicatcly 20 a. 10 respond 10 very
slight pressure.
Tho ellis system OF ventilation h.
based on one Of tho best methods flr
removing foul air from rooms. This
requires large central shsft running
from the cellar 10 the top OF the build
inl; iu each room adjoining OPENINGS
ace made into the shaft both near the
u or and near the ceiling; thCsc arc
fitted with registers AMI valves. A
steam pipe passes up the middle VI the
snaii; anu the heat from tuls causes a
violent up.cnst current ,neclually
aspifaung Dir from the r01mt.
Az opposite application IL seen lea
the Lyman ventllatof, which consists
ola box Of coarse leo ut the TOP OF
large pipe; ait Ia contact with tho Ice
becomes cooled aud consequently falls
through the pipe and moro air follows
In this way abundant currents OF frcsh
air may be- carried dlwnwHtd aud
over tho bcds OF the sich,
about decks anu Ia other small ways.
tNolo--ihtse devices as also those
tnat follow were all illustrated ia the
lecture by drawings or models. No.
chanioal means VI olucting tue mo We
meut Of nif bodies ntu usually efficient
but ,Xpenaive. Faus, driven by steam
or electric U0wnr,atn now largely used,
on small scale thcy are act on tables,
desks aud the like Tor producing local
cooling currents, In larger why they
are employed cithur Tor arriving large
volumes Of air through tue iluel Of
building or for aspifating air from the
tuildings 10 thnt more Will uutrT.
Ia any eystem OF ventilation amplb
care must 10 bestowed In providing
botn an inlet and an outlet tot air; aud
IN the neglect Of one OF these require.