Fort Worth gazette. [volume] (Fort Worth, Tex.) 1891-1898, 1891-09-10

a body. then, must De colder than IL.
contiguous atmosphere before tie dew u,t.
oe deposited upon it. - Pend.eton Us.
much colder tina, body must be c4p-.
largely upon atmospheric conditions de-.
can be condensed only in cIsc where -,....
mosphere is entirely satJrated with HOS.
IRE. If 4 fully saturated atmosphere no
over surface bu- one degree Low.
temperature than thai maintained 10, tit
atmosphere, there MUS. with .-ucr ....s.
favorable, be a drpos., of dew. J. a-.
not be a regular spider weu Loader o,. >. ...
drablcr, but il viii be- dew a' r q >...
even though II quantities So urd4r- .- ..
require instrumental les; FOR drtr,-ig.
such case the dew point wou.a ~.4..
temperature one degree b, .Ov rh, r--..y-.-
ture Of the atmosphere If Tie ear. -.
perature WAS st..l lower t..e ,.r-. r.....
from a saturated a,mo>phrr. O. -l- --
perdtUra just considered Would be-. l.....
of course
In edse whore The atmosphere Is 4a-
saturated with Dr. etllr. # BIS. ......
tracjed INTO saturatiou b. cou;ar, vii. -...
colder surface ere dew can be drp,-.-..
We will suppose that the nigh az has.
temperature of - degrees. and is SSH. ..
thar Temperature redIrfi1u of lo c..-..a.
would be necessary 10 reduce tito Cd So. -..
saturatiou; the temperature of f.r r..-.4
surface would then have 10 stust IT. s..-
point below - degrees ere any Dew, r....
I,. a,
deposit might be extremely ,isl.-. as ..,
reduction OF ar 10 saturat!ou night ...,s
tend Ealt dozen inches above ,n,. ~..rt....-
Thus, You see, that while Their, Is ". Ire
scale Of our Thermometers .tr...,.
point a boiling point, ana 50 on. ,a.,.
can be no regular dew point, owing ro co..
staut variation of conditions. The .a..
way 10 get Al the dew point, SO ,...,L. u.
a region as 10 high or low would be ,a..,l-
age through SiveI. time tie earth tenn. q.
a'lre bringing dew. If the average showed
higher degree for North Texas .L.s
the coast country then j, nigh, ty -..l ..--
North Texas w2s, Of the TWO Ir-.u.>...
region of high dew point. az, ro-. n.-
perry. q region Of higher dew ru.a. ae ....
pared 10 the coasf region.
Without the knowledge ot ANY po..r.r.
tests We nave reasoned that ri rie -y.r....
gious named. North Texas mast pe 'a.. d.
Of higher dew point. On account q. .,.,e
atmosphere ~ tb. coast Lecess.ra-- ... d,
lower range OF earth temperature - bring
dew. Of course should We rerkol, I,r.rr,.y
from the ar Temperature the lrSyes' t..t.r,
of variation might be found al the coa-t. OLA
an average, owing 10 u more humid a-;u.s-
phere there, but this would tell ro;.5 81,
TO what regularly belonged % The regions -,
far as related to the average earth ty'Hp...-
turc necessary To give doyy. The ..l-,--
phere just in from IN" sea would. il. 81.
probability, ba nearer Il state Of Sarurati..
than would the same atmosphere a,,"r .-
had rolled inland to, SOY. Fort Worth. Ba-
fore reaching Fort Worth :; would have
lost more or less of is humidity, a-.d ou
this account would be further from ,as
earth dcw-point, measured i'll declr-, 90
the thermometer scale. than when j. fist
struck the land. But il would also 10
warmer, for ii must he rrmembrrel hat
water can be made warm Is well rs Art
can he raised to the boiling point ErH,
suppose the air strikes the coas- AZ "a r-if-
perature Of - degrees, AMI tn-.
it is 50 near saturatiou That
i temperature four degrees ly,yrl
would put it into that condition: III. II 80
earth temperature Of 30 degrees voll
leave trace of dew upon the land. B5 tae
time it has rolled inland to Fort Worth ina.
air has lost so much moisture that lower
temperature of eight DEGREES would b. nee
essary 10 contract ii into saturation; nut u
the same time its own Temperature has
been lifted TO 30 degrees. Deductiur tLe
eight degrees we nave our dew point a. aa
earth temperature of 81 degrees-ouc dc
gree above the dew point on the coast.
OF course this Is theory, but it is cer-
tainly reasonable and the pest that can ne
offered in the absence of series Of actual
tests.
The old ether hygrometcr marking reg
ular dew point has long sine gone to tho
things that were, and the notion of such 49,
idea As pointed out by that once popular I'D
instrument lives now only in the mind, u
people who read old scientific literature eN-
cIusively.