The southern sentinel. (Winnfield, La.) 1883-1910, 1884-11-21
SCIENCE AND INDUSTRY.

Acoustic canes are French lnven,
lion for the benefit of persons iicted
with imperfect hearing.
The electric street-cars OF C,eNe-
land, o., make eight miles an hour
easily.-G eretand Herald.
4 Paterson silk manufacturer mas
taken out a patent for process ny
which cotton and silk threads may Dc
twisted about light wires, to produce
the effect of an ostrich feather or plume'
for ladies' hats and other purposes
Negdra; Register.
florida appears to be the Land OF
Flowers" to some purpose. The Nd
ional Druqgist says tina the manufac-
tura of perfumes from Florida flowers
is becoming an important industry, ana
that a process has been recently devised
for extracting the sweet flavor OF the
cassava plant.
The employment of an invisible
actinic ink, of which there is no trace
on the paper or in the image upon the
focusing screen. it is said will prevent
forgery of bank notes. AS soon a one
begins to develop the plate the word
forgery written with the ink, ap-
pears on the negative.-Boston journal.
What is claimed to be a valuable
rust protector IS among the recent Ger
man inventions. 1t consists of ordi-
nary oil paint mixed with ten per cent.
of burned magnesia, baryta. or strontia,
as well as mineral oil. This neutrali es
the free acid of the paint, and the al
kaline reaction protects the iron from
rust.
"A new MISUNDERSTANDING tele-
| graph system was recently tested. In
| i've minutes there were sent over one
| wire, in six circuits, 1913 words while
| sos were received. In ten minutes
| over one wire, using six circu t., 2, PA
words were sent, averaging about thirty
seven words per minute to each cir
| cult aicaqo Herald
| A design has been submitted to the
! Australian Minister for Water Supply
of a continuance for bringing down
rain. 1t is in the form OF ba loon,
with charge of dynamite underneath
/ it. The balloon is to be sent into
the clouds. and the dynamite is to be
| flied by wire connecting it with the
earth. The inventor. Mr.. E. S. Haines,
/ of Richmond, intends to try it in the
/ dry districts of New South Wales.
i The air brush was one of the use
full and interesting inventions exhibited
at the recent Photographers Conven'
ton in Philadelphia. A little holder i
charged w tn India ink. and by bel
lows operated with foot pedal. after
the manner of sewing machine. the
fluid is blown upon a family outi!not
j portrait. the result giving picture SUI
perior in many respects to the best
crayon drawing. A life-size portrait
NAV thus be made IN few hours
where as formerly by the use of the
stump and pencil as many weeks were
re uired. Philadelphia Press.
A correspondent OF the Scientific
american has been figuring on the rec
sunset question. He says: 80 esti
innate the possible quantity of ashes
required to give the red tint required il
the sky, let us assume that an inch o
ashes are spread through ten cubic
wards of air. This gives dilufion o
, Is. 900 times Astronomers tell us the
cause of the red light reaches sixty
miles in the air. At the rate of diffu
sion of the ashes that is assumed. thi.
would require mass of forty-two mile
of cube, or a mile of ashes one mill
, high. iorty-two miles wide and 1,70'
miles long.