The weekly messenger. [volume] (St. Martinsville [i.e. St. Martinville] La.) 1886-1948, 1891-06-13
POPULAR SCIENCE.

One volt of electromotive force is gene,
rated for every 100, 200, 600 lines of force
cut per second.
An Australian photographer is reported
to get excellent pictures Of objects at a
distance of sixteen miles.
A French authority estimates that cats
are responsible for thirty per cent. of the
cases of common contagious diseases.
Scientists say that the orange was orig.
inally berry, and its evolution has been
going on for more than thousand years.
The electric light of 10000, 900 can
dle-power in the lighthouse at Hanst-
holm, Coast of Jutland, is said to be tho
most powerful light in the world.
One of the interesting facts of physi-
ology is that the human body generates
enough heat during the day to melt forty
four pounds of ice and raise it to the
boiling point.
The speed with which the bodies
known as meteors enter and pass through
the atmosphere Is so much in excess of
that of cannon ball that there is no COM
parison between the two bodies.
In these days of so many alleged cures
for consumption, oysters are commended
and are given to consumptive patients
because they contain iodine. The treat
ment is quite common in the South.
The hourly rate of water over Niagara
Falls is 100, 900, 900 tons, representing
1G, 900, 600 horse power, and the total
daily production of coal in the world
would just about suffice to pump this
water back.
A special kind of paper has been in
vented, which, it is alleged, is absolutely
impervious to water, and will even stand
boiling. The water-proofng can be car
ried out either after the paper is made or
during the operation of making it.
It has been calculated that the electro
motive force of bolt of lightning is
about $500, 900 volts, the current about
IA, 600, 900 amperes, and the time to be
about 1-20, 900 part of second. In such
a bolt there Is an energy of 2,450, 00O,-
900 watts, or }, 2s4, 1872 h. p.
The brightness of the moon is not so
very much greater than the brightness of
the same area of sky. The total light of
the full moon can be compared with the
total light of the sun, though it is very
difficult problem, and the result will be
that the sun is as bright as $4,000 full
moons.
The respiration of insects has been the
subject of study by NJ. Contejean, who
has found that, contrary to what takes
place in vertebrates, the movement CT in.
'piration is passive and that of expiration
active. The air is driven from the body
oy contractile effort. Hence, when the
insect is wounded the flow of blood &C.
,urs at each expiration. The respiratory
not interrupted by cutting of
he head, nor by the absorption of curare,
which produces an immediate cessation
n man.
One of the most hazardous mauufac.
uring processes is likely soon to become
thing of the past. The great increase
II celluloid manufacture in recent years
las made camphor so scarce and dear that
ne chemists have been exerting them
elves to find substitute for that gum.
some one has now succeeded in doing so,
md company has been formed to manu-.
acture the new product, which is de-
cribed as possessing all the good qualities
# the old inaammable compound of gun
otton and camphor, while being cheaper
nd, in addition, absolutely incombusti-'
lie.