The Dallas daily herald. [volume] (Dallas, Tex.) 1873-1887, 1880-11-19

SO les of years have furnished basis for the
deduct on of fixed rules as to the products of
specified conditions of the atmosphere, and
the science of clouds guides the observer to
storm centers. But to arrive at these rules
tho ntmosnhere, AS Professor Nj ury says, had
to be ''sludied rs a unit and by the stimuli
taneous system. The farther the area of
observation is extended on this continent
the more accur to will be the force SITS.
The advantage to agriculture and BUSH
ness and shipping is enormous, and our own
country has taken spondidly prominent
part in the development OF weather science.
The average per cent. Of the accuracy of
forecasts of the state of the weather has been,
during the year, ninety-three and three
tenths per cent, and an analysis of weather
forecasts with reference to the districts in
which the pre-annolnoement have been
made and careful comparison with the
weather and other instrumental changes,
have given an average of eighty-six and four
tenths per cent. of accuracy. AS to the pre-
announcements of cautionary weather sig
nails on coasts, eighty-three and four tenths
Of them have been accurate. Every great
storm which has swept over the United
States has been pre-announced. The number
Of farmers bulletins distributed every day is
g. 1877, and they are regularly displayed AZ III
H. IN. In addition TO this the signal service
department is about TO issue an instrument
called the Farmers weather indicator, which
gives the results Of combination of several
instruments, and is easily understood by any
one. Ninety five railways, with 1889 stations,
Iur tho al
Frost indications have been added to the
W. k for the benelltof the sugar interests OF
Loulslani, and the indications are given
lhree days in advance. A system of warnings
for the cotton interest Of the south ia also
under consideration. This will greatly add
to the work Of the department, whose obser-
vALiOns now number 1912 daily. be system
Of international bulletins, representing The
record Of observations taken all over the
world, simultaneously, is continued, The extern
sion OF telegraph lines throug thecountry
extends the work of the signal service, and il
is foregone conclusion thNt the service
must be- kept up and well supported. 9TH,
results Of the past" says the port, "givt
encouragement for the future of the service
The advance has been stendy and satisfactory
rh 70 is no longer Il question, after ten years
practice, as TO the useful preannouncemen
of meteoric changes. The field OF usefulnts
widens with each advance. Added to wha
has been done hitherto, the way opens clea
to all in every agricultural interest" TIL
rules which at present etlectuate the predic
tons Of meteorology are few and simple
Storms are the results Of opposing current
of air, cold and warm, polar and equatorial
Those of winter results from the MOVING
northwest from the southwest of warn
equatorial current overlapping a polar cur
rent. Summer storms are caused by tn
moving ola cold polar curr, mt south art
against an equatorial current. The pola
currents come from the northern semi.cirele
and from northeasterly direction, Thu
area between the two curren s, when the
move past each other is the area of rslm o
low barometer, caused by naturalization
Electric excitement is produced by tle fric
ton of the opposing currents heating III
air. The region Of high barometer is tbo
of either current b fore moetir e each Other
md the region Vt highest barometer
Ihat of the coolest current which produce
the most pressure. Heaco, under the fot
mor condition, the air rises and the bAromC
ter falls, and under the latter the air pres
sure makes tho barometer rise. The rLi
area Is beneath the slope of one current ovc
another, With the advance of weather scieuC
has come the invention OF instruments of Tn
most beautiful mechanism, as hiss been Ii
case in the advance of the science Of astror
omy, md the literature of meteorology
now becoming very volumnOus.