Martinsburg herald. [volume] (Martinsburg, W. Va.) 1881-1920, 1892-03-05
PopULAb SCIENCE.


Barrels are being made successfully
from paper in England.
London, England, has electric FIRE en-.
gines now on exhibition.
The density of population is greatest
in Europe, where it averages ninety -seveL
to the square mile.
fresh discovery OF tin is reported tc
have been made at Kowloon, opposite
Hong Kong, China.
A Paris (Frauce) photographer has in
vented IA process by which the colors ol
his subjects are reproduced.
Electric push buttons, using dry bat
teries, are 10 successful operation on the
cable road in San Diego, Cal.
An electric stop-watch is now made
which will show the time to within the
one-hundredth part of second.
The average annual rainfall in the
United States Is 296 inches, the varia
tons ranging fron 0 to about 125
inches
1t is said that if the "voice" of an
elephant were as loud in proportion as
that of q nightingale, his trumpeting
could be heard rou,,d the world.
1t has been fou4d that by the use Of
the sand blast the altering on tomb
stones eau be done st greatly reduced
cost, with no sacrif:s OF beauty in the
result.
The s,ar Sirius. which is shown to be
about double the size of our sun emits
from forty to sixty fo.d more light than
the sun, owing to is L.atter being much
moro dIifused.
A Frenchma1 has Invented a new and
ingenious frictiouaI machine. Mercury
is forced by means Of pump through
the pores Of pieca of cha1ios, aud
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, taat colds are oftener
caught by those who wrap themselves up
and avoid the severity of ths weather
than by those who brave the clements.
A knowledge oSthe physiology of the
human larnYx has male it possible to
supply artificial voices to people who
have been deprived of the one nature
gave them, aud a number of cases are on
record where the cavity has been opened
and larnyx, made OF suitable material
with rubber membranes, has been in
serted and become of practical use il
speech.
OF rooms of poor hearing qualities
DR.. Ephralm Gutter says: Every hall or
church has its keynote, aud the audience
will hear better if the speakers voice ia
pitched and held to the keynote of the
room. To fad the keynote, sing the
natural scale slowly, evenly aud smooth
Is, 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, watch 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 CT 305 miles a
second, while if the observations of DIR.
Elkin are accepted, Arcturus is travelling
at a speed of 375 miles a second.
The durability of iron railway bridges
is being investigated by several of the
European Governments rs 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-tive years, and under certain
conditions their life IS much shorter.