The Forest Republican. [volume] (Tionesta, Pa.) 1869-1952, 1891-07-22
SCIENTIFIC AND INDUSTRIAL.
Electrical tanning is satisfactory.

A lighthouse burner IS equal 10 {, o,OUU,-
900 candles.
An Italian hos invented q new fuel
prepared from Ignite. 1t has been satis-
factorily used for running locomotives.
The largest telescope lens ever ground
in this country is now in course of polish
ing at Greenville Penn. II measures
thirty and one-h half inches in diameter,
five and one-eighth inches in thickness.
The application of the microscope to
machine shop practice, for the purpose
of proving whether surfaces are true, Is
pronounced by experts as being the best
method of obtaining accuracy thus far
suggested.
An apparatus for testing the smelling
capacities Of individuals was recently ex-
hibited in Paris. 1t is said to determine
the weight of odorous vapor existing in
given quantity of air. The invention
Is called the olfactometer.
A man named Jones, of Cardiff,
Wales, is said to have patented a sewing
machine without shuttle or bobbin. The
thread is supplied directly from two
ordinary spools and sows through the
assistance of a rotary looper.
Moulds for casting iron eau only be
made in sand. Iron and other metallic
moulds chill the ircn, and it does not
fill well. The great heat at which iron
melts will burn any other material, or
will stick 50 as to break the mould.
One of the novelties at the st. Pan
ctas Exhibition, in London, lately, was
a sausage machine, driven by electric
motor. In conjunction with this ma
chine it has been proposed to employ
an electric heating attachment, whereby
the savory dish can be delivered cooked.
A successful exhibition was given in
Philadelphia recently, of tho system of
storage batteries for propelling passen-
ger railway cars, as introduced by Messrs.
Wright g. Starr. A special feature of
the new system is the recharging of the
batteries by retrograde movement of
the motor.
The run from Baltimore to Phila-
delphia of the Royal Blue Line Express
is made behind what is said to be the
largest engine in this country. 1t weighs
1S7, 900 pounds, and runs on four driv-
ing wheels six feet six inches In diam
eter. 1t is black, without particle of
bright color about it.
A new method of ventilating railway
carriages and preventing dust from en-
tering with the air has appeared in
France. The more quickly the train
moves the more rapidly the apparatus
works. The air is made to traverse
receptacle containing water. which cools
it and relieves it of dust, after which it
goes through another tiltering before en-
tering the carriage.
State Entomologist Lintner, who was
summoned to Catskill recently, to examine
new pest which was running the pear
crop of that place, finds that an area
three miles in diameter has been occu-
pied by the most dangerous fruit pest
that has visited the State in years. 1t
is the Diplosis Pyrivora, or pear midge,
which is common in Europe, but first
made its appearance in this country ten
years ago at Meriden, Conn.
The great electric searchlights of the
modern man-of-war may have an often.
sive as well as defensive value. There
was sham attack upon Cherbourg the
other day, by squadron of the French
navy, and during the manguvres the
torpedo boat Edmond Fontaine was run
into by cruiser and sent to the bottom.
Her officers report that they were so
dazzled by the sUarchlight of one cruiser
that they were utterly unable to see the
ship that struck them, aud SO could
make no effort to get out of her way.