Greene County herald. (Leakesville, Miss.) 1898-current, 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 Burlez's machine created SO 1t is said
a downward moving "hoe in the air.. and TINS
struck Lieutenant Briefs monoplane In such
manner as to destroy its equilibrium. Lieutenant
Briez and his machine dashed to the eartn,
the aviator having both legs broken and Delng
otherwise seriously but not fatally injured In
this the innocent cause of the accident was
the movement of the aeroplane passing above
at height of hundred feet, while Mile. Du-
trieus drop was probably brought about by the
maneuvering of the two monoplanes beneath
her. These accidents have brought US face 10
face with new problems in the art OF mechanical
fight-they show us 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 imag1nes
that they are areas of partial vacuum which fali
to give the flying machine proper support. Inc
hazard they present is reasonably pictured all
the greater because there is no visible sign OF
their presence-the aircraft just suddenly starts
to drop and may fall several hundred feet before
the movement can be corrected, II corrected at
ALL If successful the incest Judgment is required
on the part of the aviator lest he suddenly bring
pressure to bear upon his planes In excess Oh
their reserve of strength Collapse or THIS soru
has happened with dire results upon number OF
occasions. But notwithstanding these pnysfcai
evidences or something wrong, SLlii, IL LILO 0sAASs
er sense of the word the term air hole IS mis-
homer and cavity as such does not really exist.
Did you ever watch the surface agitation OF a
boiling pot? Well, that is substantially dupli-
cation of Just what is going on in the air about
u.s. The earth acts like great reflector OF the
suns heat and starts the air boiling below here
where we are and sends 1t upward in great col
umns of rising atmosphere Ike the movement OF
the boiling water in the pot This Is what the
meteorological calls 'convectional disturbances
of the atmosphere, and he tells US that this state
of things would not annoy the aviator II the ven
turesome arman would only keep aloft al
height of from four to five miles-a matter OF
from $1,000 to $4,000 feet in round numbers!
Georges Legagneux has recently reached the
amazing height of 1876 feet.
We are all familiar with the old saying, what
goes up must come down" In the agitated belt
of air the upward rising column of warm air rs
replaced by descending column OF cooler air.
The downward moving column is what really con-
etftutes the so-called ssholes" OF the aeronaut's
parlance. The layman scarcely appreciates the
conditions that are bringing about this conyee-
ton or boiling motion. When the sun strikes the
earth the air is heateA and rises; In the shadow
OF cloud the air is cooler and descending This
see-sawing is OF greater or lesser magnitude de-
pending upon the dipectness of the suns rays
and the temperature cf the air when shaded.
The evenness of the aviator's flight or the uni
formity OF his line OF advance-whichever You
choose to call it's controlled by the constancy
of the pressure which the air exerts on the
under or lifting side of the planes as his machine
is driven forward by It's motor. The net result
is sustaining or lifting moment, as the engineer
expresses It. II the approaching air, instead OF