The true northerner. [volume] (Paw Paw, Mich.) 1855-1920, 1882-06-09
THE WORKSHOP.

NOTHING will prevent silver furnishing
IN an acid atmosphere.
PLATINUM crucibles, on being ignited,
suffer greater or less decrease in weight
when they are new, but after repeated
ignition such changes no longer occur.
HANGINGs for walls, printed in size on
cotton, linen, or leather, and the pattern
then busted over with flock, SO as to
produce an imitation of velvet, were first
made in France about 1920, and in Eng
land few years later. Paper hangings,
which naturally followed, we've a much
later invention.
A. M. STANLEY, of Wilmington, n.
O., has discovered that there literally Is
such thing as "fat pine," and has in
vented machine with which to make
pine oil from slabs and other pine refuse
from mills. He claims that one cord of
light wood will yield eighty gallons of
pine oil, worth, at manufacturers prices,
twenty-five cents per gallon.
PILES have lately been driven by cleo
tricity across the River Lea, at Hatfield
Park, the seat of the Marquis Of Sails
bury. These piles are to support a
cofferdam. The power was transmitted
nected by two conducting wires to pile
driver on a barge in the river. The
"dolly" weighed from four to FIVE hun
dred pounds. but was moved with ease
and regularity.
A GERMAN manufacturer has arrived
at the conclusion, automatically, that
in wind mills the most serviceable wind
is that blowing at velocity of twenty
three feet per second The fans of the
mill, with such force, revolve with
nearly double the velocity of the wind.
In the vicinity of the observer, the
lowest number of days in the year that
the wind is serviceable is $50 and the
highest number $50.
A SIMPLE and needed improvement has
been made in the tin cans used for pre-.
serving food: The body of the can has
beveled rim, upon the slope of which
the cover is soldered. When the cover
is tapped around the edge it is expanded
and the solder joint broke by the wedge
action of the bevel. The can is thus
opened without injury to the lid, while
the present inconvenient and even dan
gerous process of cutting open these air.
tight cases is entirely avoided.
REFERRING to life-preservers and fire.
escapes, contemporary well suggests
the following To staple firmly driven
in the wall, Immediately over each win
dow attach a rope or cord, say three
eighths of an inch in size, and long
enough to nearly or quite reach to the
ground. This cord should be well-made
and pliable, and might be knotted at
intervals of about fifteen inches The
cord should be rolled into coil or ball
and tied in place by small cord or
strap, ready at a moments notice to be
united and the end thrown out of the
window. Men and women could descend
it, or it could be tied about the bodies
of the weak and they be quickly lowered
to the ground.
CONCERNING cleanliness of boilers the
MachiniSt says: If dirty water is used
In boilers they should be frequently
washed out If they require it every
week, it should be done. We remember
an instance some months ago where a
set of tubes were greatly damaged and
several of the bottom rows burned out
by reason of the dirt within the boiler.
They were repaired and the same thing
occurred again. Finally, the suggestion
was made to wash the boilers once a
week if they were dirty, which sugges-
ton was carried cut, since which time
there has been no trouble from that
source 1t has also been noticed that
the valve seats and cylinders are not
scratched as much as previously, and
the boilers steam very freely, which, of
course, reduces the coal consumption.
Boilers should be always washed when
they are dirty.