The Big Sandy news. [volume] (Louisa, Ky.) 1885-1929, 1906-06-01
Cyclones and AnticycIOnes.

fA-r ut1fo1ta4cAc = an tuhNiciA "
aver Of gas thar We call air covering
.hswhOle earth Just as the peel covers
II orange ii is unlike the orange
peel in that it is free To move, like
Naser. The air Is. in fact, a sort Of
ocean that flows above US.
The air. like other gases. IS com
pressible. and the lower layers q
the atmosphere, which have 10 bear
the weight of the upper layers. are
much denser than the upper layers
because the weight OF these upper
LAYERS is pressing down upon the
LAYERS underneath. just as the hay
al the bottom Of a stack OF the lay
ers Of wool al the bottom Of pile
Of fleeoe are more closely packed.
You can readily understand that :
crab in the ocean or cawfish in
a pond must feel the differences in
pressure as the waves Of water 20
over him. especially in the shallow
water on the seashone. where waves
nEe or six feet high frequently pass
over places that had only few
inches Of water a moment before. The
changes in the pressure Of the air
are not 50 sudden nor so eNtrenis
The average pressure is about fif-
teen pounds TO the square inch. and
n extreme cases change Of only a
pound or a pound and half taxes
place in the course Of aday.
The pressure Of the ar S measured
With an instrument called the baro-
meter from two Greek Wards. barus,
weight. and meuon. measure, wheao
baromelTic pressure is spoken Of.
meaning pressure measured withrihe
barometer. aad as the barometer z
only used 10 measure atmospheric
pressure. baromarse pressure Is sim-
ply pressure of the air
/ The barometer most ,7mmcnly used
lis called the merruraI barometer 7ai
consists Of a piece q glass tube
about a yard long. closed a, one ena
lby melting the glass together. This
tube Is tightly covered with The in.
ger turnsd end fa- end. and The
ouea end IS put under the merc1ry
In the boRI aad TIE finger uks7
ave-. The mercury in the tube rna'
out into the bowl until about 30 inchs
Of mercury remain in the tube. ieay
Ing al tie top an empty space Th'
lpreszires Of the mercury ia the iuo'
and the air outside balance elei
lnher. in just the same way a. IN
columns Of Naier in the two arm
lof a U-shapsa tube balance eaei
lc.her. when the pressure 81 ,ni
/ air becomes less. the pressure g
The surface of the msrcur, IN th'
bozl becomes less. and some Of IN
me-zIry runs cut Of the tube int
the boxi II this case the harumets
: i said 10 fall. meaning that TIE -
; Of its column Of mercury 5 lJWei
When the air pressure becomes great
2 er. ne pressure on the surf7C Z 10
2 meRury il The b0xl beosmes greater
3 ard the mercury ruus back up inu
2 ,hs tube Then the barometer s. sal
D TO rise. meaning that the top q ID
, column l. higher These ehaage3 q
mzzu-ed u plaGag piece u me z
!. rusrkss like q ruler Or yarls.ck p
q sde the tube OF ne barometer Til
. i caHsa The sale Il the blr1msiei
: and besause the scale IS divided e..
iacses the pressure is spoken 81 G
e besns 50 many iaches q he hlrs
2 msier- the inches ars tlbilvitt
I into te.-hs AID hundrel 1hs On p
weather nap lines are drawn ,hroHs
IN the places where jNs barometer
E resdins Is the ssme There are sll'
7 sspas Of harometers besides the ma
e c1naI haronstsr. a Md s-U ~
!. unsafl, seen : the snercid bar'
b meter tsas1oid from a without, on
= neros. Hei- With1ui iluidl. when 81
+ siss a snail metal box vita
{. sprius .-lzde Wen The pss-u
[ Ibscrmss greater the sidas Of %
+ box are pressed together, and Hh.
d she pressure becomes less the s:d
2, are pashoi outward By lie apf.1
IS The sides are c7laected hy a 'hre
II 10 a hand thlt moves around d
D like the face II locE Ba-oias'r
= can he made with water Instead
p mercury. h-t then the tube he's
. be sbour 50 fes, high \ iiiisrer
y n an iuca in ths Aeieht i q
7r mercury il the barometer oarr'
p5nds 10 differs=pe Of about
o bsn a pound Of pressure % "a
square inch
y 10 be oelunasd1