The Colfax chronicle. [volume] (Colfax, Grant Parish, La.) 1877-1981, 1889-11-09
SCIENCE AND INDUSTRY.

SCIENCE AND INDUSTRY.
Tho sand blast 10 now used in clean
ing the dingy walls Of stone buildings.
The number Of cotton mills in the
South has moro than doubled since 1851.
AT the Schuylhill United States ar
senal. near Philadelphia there is man
ufactured each year 10000 rounds
of ammunition and Is, 600, 600 rife balls.
"A mixture Of finely powdered mica
and crude petroleum Is said to be CIV
ing remarkable results a. lubricant.
"A poultry-fattening company has
been organized in New York, to fatten
fowls on the French plan. 1t Is pro-
posed to handle 100. 200 birds every
three weeks.
The oxygen band in the spectrum
of the electric light from the Eiffel
tower was. at q point Eve miles dis
tant, found to be similar to that Of the
suns rays. kks .
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.
Tho 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.
AT Alba, Mich, there is a concern
which annually cuts about 5000, 600
/ 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 Architectural In
Paris. The walls, partitions. roofs and
waiuscoating are composed Of double
metallic sheets, separated by different
non-conductors OF heat. -
| Blanche Howard, a female doctor,
gives statistical proof that the NOR
tality from diphtheria is rapidly In
creasing. Twenty years ago in France
this mortality was between Sc and 4!
deaths in every 100000 inhabitants
now it amounts to no to 12l In every
100000. In England toe deaths II
every 100. 900 number ~; in America
go to 90; in Germany, 140 to 165; II
Christiana, $40.
Each tor of coal used BY the thre'
principal gas companies Of London
England. costs. on the average, III
l0d; but a. it produces ~ cwt Of coke
10 gallons Of tar. and other residuala
J which sell altogether for about 7s 103d
the net cost OF the coal is reduced to
little under As per ton. A ton OF COS
; produces between 5000 and 10000 fee
.. of gas.
The following interesting exper
ment was recently tried at the Roys
Academy Of Science: A lath or thi
slat of wood was caused to rotate YER
swiftly, as If on q pivot, and on th
: surface thus formed q picture was pr
jected by means Of stereoptico'
: The picture had the appearance
existing in the air. without any bacl
y ground. for objects placed behind
could be seen through it.
II -Waxed paper bags are now mad
e the interior surface Of the paper beir
e lined with thin coating Of parafin
9 which renders the bag substantial
+ alright and waterproof. Confectio
> cry, fruit and other eatables may
q kept wholesome and fresh. and thu
6 are useful for druggists and grocer
l. Coffee or cheese may be kept In the
h without losing their aroma, and larg
'f sizes are valuable for storing clothil
Is and MANY other uses.