Lincoln County leader. [volume] (Toledo, Lincoln County, Or.) 1893-1987, 1903-07-03
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In a test of the electromagnetic can
non of Prof. Birkland, the Norwegian
physicist, twenty-two-pound pro-
iectile from a -half-inch
bore was made to penetrate to depth
of sixteen inches; and it is claimed
that a projectile Of 1, 100 pounds could
be discharged from a twelve-inch gun
with a speed of more than two hun
dred yards per second, without flame
or explosion. The special advantage
is that projectiles can be discharged
with a force that would destroy the
gun if ordinary explosives were used.
The Hewitt mercury vapor lamp was
recently exhibited in London, and the
remarkable effects produced by Its
light upon the appearance Of colored
objects attracted great deal Of at
tention. A report in Nature says: Tho
light plays such pranks with color that
the color sense seems to have gone
crazy. One red thing will appear blue,
another black, one blue thing blue, an
other brown; but the skin becomes
CHASTITY" The color of a particular
hue of crimson is gloriously enhanced.
For any purpose where color Is not
Of Importance the light is pronounced
beautiful, and its production is very
economical.
A singular property Of gelatine,
when spread upon glass, has lately
been experimental with by the French
chemist, Cailletet. When thick lay
er Of strong glue, that has been al
lowed to dry upon a glass surface,
is detached, it carries off scales Of
glass and leaves designs resembling
those of frost on window pane. Pol
ished marble and quartz are similarly
attacked. With glue containing six
per cent Of alum Monsieur Cailletet
produced five designs, resembling moss
In texture. Hyposulphite of soda and
nitrate and chlOrate of potash, added
to the glue, produced analogous effects.
The glue while drying exerts a power
full mechanical strain.
An earnest effort Is now making to
save and to restore the fast-disap-
pearing forests of the United States
by spreading scientific ideas aud in
formation about forest trees through
educational centers. There are three
higher schools Of forestry In operation
in this country-at Yale University,
at Cornell University, and at Bilt-
more in North Carolina. The science
of forestry is also taught in about 40
other educational establishments scat
tered through the States. Although
the total forest area Of the United
States at present covers 100000, 900
acres, the stand Of timber Is only one
tenth as great as 1t would be in sys-
tematically managed forests.
In consequence Of the construction of
the great Assouan dam on the Nile, 600
miles above Cairo, the famous temples
on the island Of Philae are partially
submerged when the reservoir is full
of water. But the civilized world
would not willingly see these magnifi-
cent relics of antiquity destroyed, and
accordingly an elaborate system of I'M
derpinning the buildings was adopted.
Some Of the colonnades and temples
were found to be resting on fractured
stone beams, broken by subsidence of
the soil. Heavy steel girders, inclosed
with rubble masonry and mortar,
which protect them from corrosion.
were placed under the broken founda-
tions, and the masonry was carried
down to bed rock beneath. The work
was done in the face Of considerable
danger, but without accident.
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