Amador ledger., 1908-11-13


second blast from which air at 30 to
81 pounds per square inch can be
turned on when the flame has been
regulated. The combination at once
raises the heat tn about 1900 degrees
f.. In this hot flame metals are weld
ed with remarkable facility, and
pieces of cast-iIon joined together
prove to be stronger at the joint than
on either side of it. Why gas flame
with two blasts of unequal velocity
should have the observed effects on
metals is not yet explained. Iu place
of coal gas, acetylene, naphtha aud
hydrogen have given equally good
results, and natural aud producer gas
would probably serve quite as we'll
Ihe pollution of streams by factory
waste Is being shown by the investi-
CATIONS of the United States Heo-
logical Survey to be unjustitied. The
experiments prove that the sewage
can bU purified at moderate cost, aud
that the valuable materials recovered
may make good this expense, while
in some cases there should be a good
profit as in the recovery OF woolfat
and potash from wool securing liquor.
Baths of oxygen, in which The
patient half reclines for 10 to %
minutes, are being employed by DIR.
Oskar Frank, German physician,
for temaie nervous troubles associated
with increased pulse tension. From
% to 80 quarts Of oxygen are gener
ated each time. The baths reduce
the excessive blood pressure and
exert a sedative action, each bath
having been followed by quiet sleep
in severe case of sIeeplessness.
The novel process of ''lIfting'' In
granite quarrying seems to have
an ancient industry, greatly ieducing
work and expense. In some locali
ties, like Mt. Airy in North Carolina,
large masses of rock are solid and
homogeneous, practically free from
joint cracks and bedding planes, and
can be split readily in straight line
in any direction. At such places it
is practicable to separate immense
horizontal sheets, several acres in
extent and of any desired thickness.
to be drilled and split subsequently,
into the required sizes. A hole is
first drilled to ii depth corresponding,
to the thickness Wanted-say, six or
eight feet, and pocket is formed
at the bottom by exploding a little
dynamite, after which successive and
increasing charges Of powder are used
to start a horizontal crack and extend
il 70 or 100 feet in all directions.
Compressed air, at pressure of 10
hole, enlargipg the crack further
until it becomes visible Oh the hill
side. At the Mt. Airy quarries, two
water be boilers, each of 2l0 horse
power, furnish steam for the com
pressor, which can deliver 1000 cubic
feet Of air per minute through the
sX-inch pipes diving the pneumatic
tools as we'll as "lfting" the sheets
of granite.
A mixture of sulphuric ether, de-
Datured alcohol, benzine, gutta
percha, gJycerine and amyl acetate is
used by Il. Dugour, OF Paris, tor i'm
tregn4ting cloth, paper, wood, etc.
and Is claimed TO strengthen and pre-
serve the materials in ndditou tU
making thom waterproof and wash
able For washable wall coverings
the composition is mixed with an
adhesive mordant aud powdered pig
Gient before applying to tho paper.
The artificial butter of A. NJ. Soren
sen, of HoisIov, Denmark, is made by
stirring cocoanut fat with little salt
aud sugar at about % degrees c.,
then cooling aud kneading with milk
containing lactic acid, bacteria yolk
of egg, and a Goloring substance.
The immersion IN oil of the work
ing parts of machinery has produced
quite remarkable results. W. Worby
Beaumont, at the recent meeting of
the British Association, pointed out
that, since the advent Of the motor
car, the size of gear-wheels has been
reduced to one tenth of that former
ly considered necessary to transmit
the power. aud there has been extra
ordinary increase in endurance.
While the special materials used are
entitled to some credit, the batn
lubrication has been tho chief agent