The Ohio Democrat. (Logan, O. [Ohio]) 1886-1906, 1889-09-14
SCIENCE AND INDUSTRY.
The sand blast is now used in Gle,

The sand blast is now used In clean;
ing the dingy walls of stone buildings.
The number of cotton mills In the
South has more than doubled since 1880.
AT the ScbuyllSill United States ar
senal, near Philadelphia, there is man
ufactured each year 5000, 900 rounds
of ammunition and 5000, 900 rifle balls.
"A mixture of finely powdered mica
and crude petroleum is said to be Civ.
ing remarkable results as lubricant.
"A poultry-fattening company has
been organized in New York, to fatten
fowls on the French plan. 1t is pro-
posed to handle 100000 birds every
three weeks.
The oxygen band in the spectrum
of the electric light from the Eiffel
tower was, at a point five miles dis
tant, found to be similar to that of the
suns rays.
South America exports many
tanned skins Of sheep, lambs and kids.
The process of tanning is imperfect,
however, and many of the skins are
spoiled or inferior in quality.
The graphophone is likely to find
novel use in medicine. Every kind of
cough may be recorded, to serve in
teaching students and for tracing the
progress of disease by future COM
parsons. d"
AT Alba, Mich, there is a concern
which annually cuts about 5000, ,OOo
feet of maple and elm logs into oval
wooden dishes. The dishes are cut
with revolving knives from square
chunks of wood.
"A system of building houses en-
tirely of sheet iron has been commu-
nicated to the Society of Architecture in
Paris. The walls, partitions, roofs and
wainscoating are composed of double
metallic sheets, separated by different
non-cCnductors OF heat.
Blanche Howard. female doctor,
| gives statistical proof that the NOR
tality from diphtheria is rapidly in'
creasing. Twenty years ago in France
this mortality was between 36 and 40
deaths in every 100000 inhabitants;
now it amounts to 10 to III in every
100000. In England the deaths in
every 100, 600 number %: i'll America,
! GO to 80; in Germany. 140 to 155; in
| Christiana, $40.
Zach ton of coal used by the three
principal gas companies of London,
England, costs. on the average, lis
10d; but as it produces y cwt. OF coke,
10 gallons of tar, and other residuals,
which sell altogether for about IS lO9d,
the net cost of the coal is reduced to
little under As per ton. A ton of coal
produces between 1900 and 10000 feet
of gas.
The following interesting expert
ment was recently tried at the Royal
Academy of Science: A lath or thin
slat of wood was caused TO rotate very
swiftly as if on a pivot, and on the
surface thus formed picture was pro-
jected by means of a stereopticon.
The picture had the appearance of
existing in the air, without any back
ground, for objects placed behind it
could be seen through it.
-Waxed paper bags are now made,
the interior surface of the paper being
lined with thin coating of paratfine,
which renders the bag substantially
air-tight and waterproof. Confection-
cry, fruit and other eatables may be
kept wholesome and fresh, and they
are useful for druggists and grocers.
Coffee or cheese may be kept in them
without losing their aroma, and larger
sizes are valuable for storing clothing
and many other uses.