The Bossier banner. [volume] (Bellevue, Bossier Parish, La.) 1859-1952, 1890-10-16
SCIENCE AND INDUSTRY.

IA ldCJOry u6dF L af4S GuFHS Oub w.
900, 600 quill toothpicks year.
Wisdom teeth, the most variable of
all in size. shape and general character,
are said to show hereditary character
istics more strongly than any of the
other teeth.
In using emery wheels it has been
found that at a high speed one ounce of
wheel material would only grind off six
ounces of metal, while at lower speed
it would grind off eleven ounces. At
this lower speed the wheel was making
2, $50 revolutions.
The proposed electric railway from
St. Petersburg to Archangel will be of
great scientific interest, if attempted.
The distance is nearly seven hundred
miles. and Archangel lies almost under
the Arctic circle-in latitude 6411 de-
grees.
The depth of a sea about six miles
deep is reduced by 620 feet by compress
sion. If the ocean were incompressible
the level of the surface would be 116
feet higher than it is at present, and
about 1000, 900 square miles of land
would be submerged.
Among the uses to which the auto
matte switch block can be turned is that
of regulating furnaces. The damper of
a furnace may be kept closed during
the night and opened at fixed time in
the morning, so that the apartments can
be warmed before the rising of the oc-
cupants, and the servants can at the
same time be awakened by closing the
switch of an electric bell current.
The Pail Mall Gazette says that
Professor Gluck recently performed re-
markable and successful operation. He
removed from one of his male patients a
diseased knee joint and inserted an ar
tificial substitute make from ivory.
The patient has now left his bed. He
walks with perfect ease, and says his
ivory knee-joint is convenient and COM
Portable in every way.
Prof. Samuel Cushman, apiarist OF
the Rhode Island agricultural expert
ment station, maintains, as the result OF
personal observation, that bees do no
damage to growing or fair fruit. The
! juice of fruit is, in fact, injurious to
| them; and they do not attack sound
fruit, but only bruised fruit, or that
which has been previously injured by
| other insects.
DIR. Devaille, of Bayonne, has been
commissioned by the French Minister OF
Public instruction ''to study the ques-
tions of physical exercise and school
hygiene in Spain. AS neither exercise
nor hygiene is among the c0SdS dt
/ EspGaG that attract the attention OF
scientific observers in the land of the
Cid DR.. Delvailles report on mis- mis-.
sion is not unlikely to recall the famous
essay son Snakes in Iceland"
For the production of daily illus
| trated paper, electricity is an absolute
necessity. By its aid pen-and-inh
sketch can be photographed in three
minutes, and in five the plate is ready
for etching. In many branches of in
dustry, electricity is utilized to greater
or less advantage, but it is novel ant
pleasing to know that there are every
day processes which could not be ac
complished with the dispatch requisite
were it not for it's powerful and ever
ready aid. Electrical Review.
-Omnibuses propelled by electrit
storage batteries are to be put in servict
in the streets of London, and butchers
carts and trucks for heavy drayage simi
larly moved are soon to follow. Mean
time it is somewhat strange that th'
various experiments which have beer
made for some years with light electri
carriages for pleasure riding in cite
have not proved sufficiently successful
to warrant their practical introduction
If the running of omnibuses, carrying
twenty-six passengers, by means o
storage batteries is feasible, why is no
the principle still more applicable t
light vehicles?-Railway Age.
An invention has been perfected il
the glass industry which, it is stated
will accomplish a complete revolution
in that branch of manufacture. Unit
the present it has only been possible t
produce sheet-glass by blowing holloN
cylinder, which was then cut, separate
and polished. An American glass manu-
facturer has now succeeded in producin
glass plates of great breadth and of an
desired length by means of rolling
Glass thus produced is said to possess
far greater homogeneity, irmness, an
transparency, and it has on the uppe
surface a brilliancy which is hardly
be distinguished from art plate glass
English Mechanic.
]