The Hartford republican. (Hartford, Ky.) 18??-1926, 1914-02-13
1vAlMS OF the AIR
Curious and Rapid Changes In
the Velocity Of the Wind.
RDlES IN THE ATMOSPHERE.

These Danger Spots, From the Avia-
tors Viewpoint, Are Born Of the Al
most instantaneous Variations In the
Soros of the Aerial Currents.
since man has provided himself with
esiDgs be has learned more astonishing
sSIpcs about the air than were dream
ed Of ia his old philosophy. He has
Dad to learn them in order to make
Sgag~ling safe on his new aerial high
way. The wind was almost u complete
enystery until aerOnauts began to make
rzwsse acquaintance with its strange
sao-sds and vaearies. The startling ex-
ceriences of aviators have stimulated
Die anemometrists-i. e.. the wind
sroasgrers-to fresh Investigations,
vsica have had surprising results.
Osnsider. for Instance. these things
(which have been found out by the
.asretechnic institute of the University
~ Paris:
u two thermometers (wind measur-
ess7 are placed side by side about sew
sxty-two feet above the ground when
wSsa Of from thirty-three to forty
aeSgnf feet per second is blowing the
<sasst remarkable differences in the We
sssity OF the wind are observed. If the
zSess0meters are only ten inches 0part
tc&S usually show nearly the same
wissd velocity. but If the distance be-
tween them is increased to about thir
III tive inches one will sometimes show
y wind velocity of ten feet per second
usre rapid than that shown by the
SE1ssr. But this difference lasts only
for an Instant. If the distance be-
x~s-asa the thermometers is increased to
Gulsaty-three or twenty-four feet. the
zsG7=sl length Of an aeroplane. the diff
Tsgs.Nces in the velocity of the wind
sssswu by them are occasionally enor-
sssstas. but Of very brief duration. This
;-@rs clearly produce IA racking effect
ss.psn an aeroplane. which may he dis
sTstasus. for one end of il may for
ss,sssld or so experience resistance
Esw1>ie that felt at the other end
sssrt this is by no means all. Not only
das.s the wind vary in this capriciOus
fast,i~a at places a few feet or few
.yzsds apart. but it varies with equal
o5tsence and suddenness ut the same
8<isst- AS is proved by fixing a single
xn<snemeter at a height Of seventy
ssve or eighty feet above the ground
AND observing the successive changes
I'm Its indications Of velocity. Thus 1t
ass been found that a wind whose av-
sSazse velocity was about thirty-eight
fs.et ger second maintained that We.
sas-sfy for as much as ten successive
EsSssads and then In second and q
dmff dropped to less than fourteen feet
gov second. which 1t maintained during
sre seconds. after which in the course
rsf half a second it sprang up to We.
i.eity Of fifty feet per second! 1t main
a;sis.4sd the last mentioned velocity for
s1sy 4 single second.
in smother case the velocity Of the
"criud rose In three-QuarterS OF II second
fYota fwenty-six and one-quarter feet
re GiS9y-seven and one half feet per SEC
o.1t
Considering these facts. II L. no Won
Scr that ayiat0rs meet with strange
-so,tGpHts 10y running into what they
81 tblNS III lHt AIR loI Tue SuHldlN-
7Eg fJrce Of the mir. on account IF the
aN>Ssn variations pf the wind. may
asuNsGt instantly lose half its valurand
fgo@a with equal SuddenneSs recover. or
ENare dian recover, its former power
Sgch things enable amy one TO under.
s1auc the peculiar perilS that the uvia-
soT tsls 10 face. Even ordinary mortals
laGw that the wind H. capriciouS. hut
~ diie navigator OF the mir II IecuIneS
sssesimes very demon, or - legion
~ demons. whose eccentric gan,bOlingS
.zrss rs uncomfortable as they are unex
.S,;ied.
u e8olS thousands of years for sea
zss.a To tearn how to face With TN
&l0s|bing hearts the vasaricS Of the
.@osaa wavesN aud currents and for
snssPbUilders to devise vessels that
-ssysd defy them. but II SEEMS likely
sa-Ss SFe Ia a few decades slnil have
sssasteled the caprices OF ia" aimos
rsf.ese and have produced a'>hips that
Will safely ride the widest wind.
* Is he advance OF Science thai has
.sfrea us the great advantage which NJ
r~s0sess 0vei our predecessors ia over
'1ozasGs aatlre's obstacics. but in
axevease Of knowledge would nel have
sr<yed rs II there had been decrease