Democratic Northwest. [volume] (Napoleon, Ohio) 1869-1894, 1889-07-25
SCIENTIFIC AND INDUSTRIAL.


Tower will be to weigh the moon.
The record of meteorological observa-
tions kept at the Paris Observatory was
begun in 1866.
Not only are human beings black OF
dark in hot climates, but other animals
vary in like mannet.
Power obtained from fall of water o
mile distant is to be used for lighting the
tower of Segorbe in Spain.
The electric light from the Eiffel Tower
was turned on a disabled boat in the
river, enabling the crew to save both boat
and cargo.
Experiments made on the dog and
rabbit show generally that the quantity
of water is less in the yenous than in the
Irterial blood.
Fly-wheels with rims OF steel wire are
now made in Westphalia, and may be run
three times the speed of cast-iron wheels,
which are limited to about forty yards pei
second for the rim.
Professor ]. P. Finley gives the width
of the path of destruction in tornadoes,
as determined from the records of eighty
eight years, at from ten to $50 feet,
the average being 1869 feet.
The Insect House of the Geological So
ciety of London is said to be the only
place where an attempt is made to attract
public attention to the various and won.
1erful groups of the insect family.
From the general appearance of the
vegetation, together with discussion OF
the origin and relations of the flora, it is
concluded by eminent botanists that
Greenland is not q European province
from the point of view of botanical geog-
raphy, but has nearer relations to Amer
lea. '..
Oil collects on the outside of lamps,
because of the capillary attraction of the
wick, which draws it up from the inside,
and allows it to run over the top of the
tube in which the wick is placed. To
prevent this, turn the wick down below
the top of the wick-tube when the lamp
is not in use.
Dry wood gives a hotter fire, and is
more economical to burn than green wood,
because the latter contains more water,
and large part of the heat of the fire
is wasted in converting it into steam,
which passes off up the chimney, thus
carrying the heat into the outer air,
where it is wasted.
The British Museum contains what are
probably the oldest pieces of wrought
iron now known as a sickle blade found
by Belzoni under the base of a sphinx in
Karnac, near Thebes; blade found by
Colonel Vyse imbedded in the masonry
of the great pyramid, and portion of g
cross-cut saw exhumed at Nimrod by
Layard.
j. E. Thickston, well known scien
tist and astronomer, believes that the
spaces within the earth's crust made
vacant by the withdrawal of natural gai
will be filed up by air, which, coming
in contact with the remaining gases, viii
cause an explosion that may throw intc
the air the whole country between LAX,
Erie and the Monongahela River.
An experienced engineer says belts O
light color should be selected in prefer
ence to darker ones. Superior betting
having an unmistakable light buff colo
| indicates that it is oak tanned and tina
the leather has been thoroughly washed
This removes all matter except the fibre
This light color is an indication that only
| the best quality of grease has been used
An inferior quality of grease not only i'm
pairs the quality of the leather but dark
sns the color.