The free press. (Poplarville, Miss.) 1890-19??, 1892-03-24
POPULAR SCIENCE.

Barrels are being made successfully
from paper in England.
London, England, has electric fire en-
pines now on exhibition.
The density of population is greatest
in Europe, where it averages nlnety-seven
to the square mile.
A fresh discovery of tin is reported to
have been made at Kowloon, opposite
Hong Kong, China.
A Paris (France) photographer has in
vented process by which the colors OF
his subjects are reproduced.
Electric push buttons, using dry bat
teries, are in successful operation on the
cable road in San Diego, Cal.
An Eelectric stop-watch is now made
which will show the time to within the
one-hundredth part Of a second.
The average annual rainfall in the
United States Is 1916 inches, the varia-
tions ranging from y to about 40
inches.
It is said that if the "voice' of an
elephant were as loud in proportion as
that of nightingale, his trumpetlng
could be heard round the world.
1t has been found that by the use of
the sand blast the lettering on tomb
stones can be done at greatly reduced
cost, with no sacrifice OF beauty in the
result.
The star Sirius, which is shown to be
about double the size of our sun emlts
from forty to sixty fold more light than
the sun, owing to its matter being much
more dlffused.
A Frenchman has invented a new and
ingenious fractional machine. Mercury
is forced by means of pump through
the pores of piece of chamlos, and
electricity in considerable quantities Is
generated by the friction.
A man of science has demonstrated by
facts and figures what most people have
always believed, that colds are oftener
caught by those who wrap themselves up
and avoid the severity of the weather
than by those who brave the elements.
A knowledge of the physiology Of the
human larnyx has made it possible to
supply artificial voices to people who
have been deprived of the one nature
gave them, and a number of cases are on
record where the cavity has been opened
and a larnyx, made of suitable material
with rubber membranes, has been in
serted and become of practical use in
speech.
OF rooms of poor hearing qualities
DR.. Ephraim Gutter says: Every hall or
church has its keynote, and the audience
will hear better if the speakers voice is
pitched and held to the keynote of the
room. To find the keynote, sing the
natural scale slowly, evenly and smooth
", or play this scale on piano or organ.
The note which is most prominent is the
keynote.
Until recently it was supposed that
the small star near the North Pole known
as No. 1880 Goombridge, which travels
at the rate of 232 miles a second, had
the greatest velocity OF any in the heav-
ems; but it is now known that Mu in
Cassionola has velocity of 305 miles
second, while if the observations of DR..
Elkin are accepted, Arcturus is travelling
at speed of 375 miles second.
The durability of iron railway bridges
is being Investigated by several OF the
European Governments as a consequence
of the late serious bridge disasters. The
result of extended English and German
Investigation seems to show that under
the most favorable circumstances iron
bridges are not safe for period exceed
ing seventy-tve years, and under certain
conditions their life is much shorter.
Children and Cold Feet.