New-York tribune., 1906-04-01
VENTILATION.

Y lSprfngTe1d VT: ID What is the
real object 0f ventilation. % how oIlen ShouIu
room be ventilated 80 Does a room in WIN
te- require as much ventlation as in summer?
ID The air ot a room is frequently rendered
more 7r less Injurious by the accumulation OF
dcsr and other suspended matters. or by an un-
Cue proportion Of one or more constituents Of
the air -- by the addition oS poisonous gases
TIE organic ritrogenous matter thrown of from
ne lungs. The enanations Of the skin and other
impurities, mingled with carbon dioxide and
wa-s-y vapor give 10 the atmosphere Of room
thar o5o- which is SO disagreeabe u those who
enter from The outer air OF the normal con
stitueuts Of the air. oxygen IS the yivifying
principle To diminish IFS normal amount in a
room by The combustion in stoves and lights,
and by -he expired air, is 10 vitiate the atmos-
phe-e To supply oxygen and 70 remove these
impurities Is one Of the objects OF ventilation.
2 This can be readily ascer-ained- The outdoor
ar contains three parts in one thousand Of car
bCnlc acid 4 this proportion rises 70 three times
ths amount Of car5oDlc acid, the harmful effect
makes Itself plainly felt Now q hard working
acult person produces about % ntres Of carbonlc
ac.C n hour. one cubic metre OF fresh air
viii absorb 06 lire OF carbonic acid Il the
amount rises 10 the permissible limit Of nine
parts q thousand. We require, therefore, q ven
--G-o- OF ttry cubic metres IN an hour. such
an amount q air would even be sufficient 70 ab-
so-b tne watery vapors resulting from strong
perSpra-i1u- The evaporation Of q person per
s1i-iug a. his work i- e room at q temperature
oe % degrees C.. hardly exceeds 10 grams OF
Wa-ery vapor an hour The fresh air admitted
through ventilation would. therefore, have 70
absorb at the utmost three grams Of watery
vspOr 70 one cubic metre But since saturated air
az % degrees G. contains seventeen grams Of
water vapor the assumed amount Of veutila-
ton would be sufficient even II the outdoor air
should enter ire room with 20 per cent humidity.
More ventilation iE. of course, required in
ErttfciaIy Illuminated apartments One coal
oil lamp produces more Carbonic acid than
person zt work. Therefore. during the hours IN
which lamps are used almost twice as much
ventilation Is required. while for the hours Of
sleep. when The production OF Carbouic acid
silks - almost a half. about thirty cubic metres
are sufficient. L IS important that the air space
be not TOO small. for. II the air OF q room IS re-
Eewed more than three times iu an hour, the
ventilation makes itself unpleasantly felt as
c-augh-, which is injurious Each Individual
should therefore have no less than eighteen TO
twenty cubic metres OF air space. 81 No. The
ventilation Of small rooms having the afore-
mentioned air space is sufficiently effected in
winter owing 70 the difference Of temperature
between indoors and outdoors. as Uell as 10 the
pressure z the wind through the pOrosiry of the
walls and covers. It becomes, however insult
A~le-- z Il IS prevented by the humidity OF the
walls or an inpervioUs coat OF OIL paint Here
and IL -he case OF larger workrooms artificial
Ve--ila-i0n is indispensBb bic.