The Republican. [volume] (Oakland, Md.) 1877-current, 1890-08-15
SCIENCE AND INDUSTRY.
"A factory near Paris turns out TO-
nnn 900 nnill tnnthn hicks a uear

J '-'
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.
I'm using emery wheels it has been
found that at 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
2,150 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 6415 de-
grees.
The depth of sea about six miles
deep is reduced by $50 feet by compress
sion. If the ocean were incompressible
the level of the surface would be ZIG
feet higher than it is at present, and
about 100000 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 &C.
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 a 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.
DR.. 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 cosos de
ESpdnd 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 "On Snakes in Iceland"
For the production of daily illus
trated paper, electricity is an absolute
necessity. By its aid pen-and-ink
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 and
pleasing to know that there are every
day processes which could not be &C.
complished with the dispatch requisite,
were it not for its powerful and ever
ready aid. Electrical Review.
-Omnibuses propelled by electric
storage batteries are to be put in service
in the streets of London, and butchers
carts and trucks for heavy drayage SINH
larly moved are soon to follow. Mean
time it is somewhat strange that the
various experiments which have been
made for some years with light electric
carriages for pleasure riding in cities
have not proved sufficiently successful
to warrant their practical introduction.
If the running of omnibuses, carrying
twenty-six passengers, by means of
storage batteries is feasible, why is not
the principle still more applicable to
light vehicles?-Railway Age.
An invention has been perfected in
the glass industry which, it is stated,
will accomplish complete revolution
in that branch of manufacture. Until
the present it has only beon possible to
produce sheet-glass by blowing hollow
cylinder, which was then cut, separated
and polished. An American glass manu-
facturer has now succeeded in producing
glass plates of great breadth and of any
desired length by means of rolling.
Glass thus produced is said to possess a
far greater homogeneity, tirmness, and
transparency, and it has on tho upper
surface brilliancy which is hardly to
be distinguished from art plate glass;
English Mechanic.
| For Ladies' with Bald Heads.