Northern Wisconsin advertiser. [volume] (Wabeno, Wis.) 1898-1925, 1912-11-08

already about six hundred feet up, when Lieu
tenant Burlez overlook him, passing at greater
speed something like a hundred feet ABOVE
Lieutenant Burlezs machine created, so II is salu'
a downward moving "hole in the air., and tnls
struck Lieutenant Briefs monoplane In such
manner as to destroy it's equilibrium. Lieutenant
Briez and his machine were dashed to the earth'
the aviator having both legs broken ana Delns
otherwise seriously but not fatally injured. III
this case the innocent cause OF the accloent was
the movement of the aeroplane passing ABOVE
at a height of hundred feet, while Mile. Du-
trieu's drop was probably brought about by the
maneuvering of the two monoplanes oeneath
her These accidents have brought us race 10
face with new problems in the art or mecnaical
fight-they show that we have much TO learn
about the air in which we are seeking to vie
with the bird
The man in the street has mistaken notion
of what these air holes really are; he 1maglnes
that they are areas of partial vacuum wnlch IAN
to give the flying machine proper support. Inc
hazard they present is reasonably pictured al,
the greater because there is no visible sign ol
their presence-the aircraft, just suddenly STARTS
to drop and may fall several hundred rect before
the movement can be corrected, IL corrected d.
all If successful the incest Judgment is required
on the mart of the aviator lest he suddenly bring
pressure 20 bear upon his planes IN excess OIL
their reserve &c strength Collapse or thls sort
has happened win dire results upon NUMBER .!
occasions But Notwithstanding these pnyslcal
evidences of something wrong, still, IN the strlcl
er sense of the word, the term air hole is ms
nomer and cavity as such does not really exist.
Did YOU ever watch the surface agitation OF d
boiling pot? Well that is substantially oupli-
cation of Just what is going on in the air ABOUT
MS The earth acts like great reflector OF the
suns heat and starts the air boiling below mere
whore we are and sends it upward in great col
umns of rising atmosphere like the movement ol
the boiling water in the pot. This is what the
roataoro1ogist calls conventional disturbances
Of the atmosphere and he tells us that this state
of +binos would not annoy the aviator If the ven
+urosome airman would only keep aloft at a
beiqbt of from four to five miles-a matter OF
from 81 600 to $4,000 feet in round NUMBERS!
Georges Legagneux has recently reacneo tue
amazing height of 1876 feet.
We are all familiar with the old saying, what
goes I'D must come down In the agltaIeo oei'
of air the upward rising column OF warm air Is
ronlaced nv descending column Of cooler air.
The downward moving column is what really con
stitutes the so-called holes of the aeronaut
narlance The Iayman scarcely appreciates the
conditions that are bringing about this convec-
tton mr. boiling motion. When the sun strikes the
earth the air is heated and rises; In the shadow
of cloud the air is cooler and descending. This
sae-sawing is of greater or lesser magnitude de-
nanding upon the directness of the suns rays
and the temperature of the air when shaded
The evenness of the aviator's flight or the uni
rormitv of his line of advance-whichever you
choose to call it's controlled by the constancy
of the pressure which the air eyerts on the
under or lifting side of the planes as his machine
is driven forward by its motor. The net resuit
is sustaining or lifting moment, as the engineer
expresses it. II tee approaching air, instead OF