The sun. [volume] (New York [N.Y.]) 1833-1916, 1888-01-15

driven OF In an unexpected direction BY On
oountsring q high pressure ersa-
III.
And this brings us to tho consideration oI
the great rival Of the cyclone among the pow
ers Of tho air. the anti-cyclone. An antf-cy'
clone" to follow our authors definition, us ar
area OF high pressure surrounded by nearly
circular isobars. The pressure is high
est In tho centre and gradually diminishes
outward. The air Is calm and GOLD In the cen.
trail portion, while on the outskirts the wind
blows round the centre In the direction OF the
hands OF q watch. not exactly parallel to the
isobars, but spirally outward. Unlike a cyclone,
which Is commonly In rapid motion, an anti
Cyclone Is often stationary for many days to-
gether. The broad features Of the weather In
an anti-cyclonc are blue sky, dry cold air, a hot
sun and hazy horizon, with very little wind-in
fact the very antithesis OF everything which
characterizes q cyclone" Further on he re-
marks that an anti-cyolono means settled fine
weather because It is generally stationary. An
anti-cyclone seldom moves onward. 1t disap-
pears by being broken up or destroyed.
As we have likensd q Cyclone to q dish
shaped depression, 80 an anti-cyclone may be
imagined to resemble q vast atmospheric noun
tain. These comparisons must not be taken
WV s0AoAAI W. shVy " "a AA0Ah - WA
sideration Of the barometric slope. In the cy-
clone the slope is down ward toward the centre
In the anti-cyclone 1t is upward toward the
centre, like tho rise Of the TANKS OF o mountain
toward Its central peak. In the upper atmos-
phere. MI. Abercromby remarks. 1t is probable
that these conditions OF pressure are exactly
reversed. The effect OF an anti-cyclone upon
animal spirits is. Of course. Just the opposite Of
that OF q cyclone. 1t possesses brilliant sun
shine and bright, genial, and enlivening air.
One is almost tempted to lay down a maxim
for human conduct based on these differences:
Seek favors and make love In an anti-cyclono;
beware OF the dog in . cyclone.
There arc certain anti-cyclones which seem
to be perpetual. Ono OF these always liss over
the central part OF the Atlantic Ocean, and Is
OF the utmost Importance from its influence
upon the weather Of both the United States
and Europe. II is known as "the Atlantic
Anti-cyclone." Its northern portion Is varia-
Bile in position. and sometimes stretches up I'M
til 1t covers the British islands and part OF Eu-
rope. In winter an anti-cyclone is generally
found lying over Mexico, and our author says
that " the col between this and the Atlantic
anti-cyclone forms the most prominent feature
In the meteorology OF the United States sea-
board" A" col " means q narrow neck OF low
pressure separating two anti-cyclones. analo-
gous to tho col which forms u pass between
two adjacent mountain peaks"
Besides coils meteorological recognize, in addt-
ton to cyclones and anti-cyclones, secondary
cyclones" "V-shaped depressions," wedges"
and straight isobars." These are all minor
forms of atmospheric pressure dependent upon
their relation to the two primary forms. cy-
clones and anti-cyolones. Recognized pecul-
arities OF weather belong to all these forms OF
o hnt ~ -pulI ror,,1rn TN rnrnh - 1,r
space to follow Mr.. Abercromby in his de-
tailed descriptions Of them.
Nv.
But these regular forms do not include every
phenomenon Of the weather. There are
certain outlying phenomena that still puz-
zle the meteorologist. Mr.. Absrcromby
origin isobars give no satisfactory clue under
the term "non-isobaric." The celebrated
southwest monsoon OF the Indian Ocean comes
under this head. There occur In tho United
what are called straight line gales. or
long streaks Of wind, two or three miles across.
blowing at the rate Of sixty to eighty miles an
hour. and extending over eighty or 100 miles
In length" These gales also come under the
head Of non-isobaric, because they are not as
with any detection Of the isobars.
Squalls and thunder storms. whirlwinds and
tornadoes are likewise treated OF under sep
arate heads. There is a very interesting kind
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