The Republican. [volume] (Oakland, Md.) 1877-current, 1892-10-14
SCIENCE AND INDUSTRY.

-~COl. II. l. SAS AO0A~~
of the New York trade schools, has
gathered statistics to show that out OF
s2S, 900, 900 paid annually for mechanics
in the building trades OF New York
CITY less than 100000 goes to men
born in this country.
Twenty million of acres OF land in
the state of Washington are covered
with growth of wood which will cut
an average of %, 900 feet of mercantile
lumber per acre Much of it in the vi
cinity of Port Crescent will cut an aver
age of 100, 900 feet and more to the acre,
while single trees are common that Will
cut 1000 feet
-Eiphty-one vessels arrived at Balti-
more from foreign ports during July
forty-nine steamers and thirty-two sail
ing vessels. Sixty-one cleared Tor for
eign ports, of which forty-nine were
steamers and twelve sailing vessels. The
custom-house receipts were: From
duties, $3.50, 5O6.S7; miscellaneous, ST.
744S3; total, S'5S, 1.20-Baltimore
Manufacturers Record.
The extent of the influence a lake
NAV exercise upon climate is illustrated
by the statement of NJ. Forel that the
quantity of heat accumulated in Lake
Leman during oSe summer is equiva-
lent to that which would be given out
by the burning of 5l,000,000 tons of
coal. A railroad train carrying this
coal would be Is, 900 kilometers long, or
nearly the length of the earth's merid-
i---~ fres-,-ynale W nole.-Indianapolis
News.
"A dispatch 4som Cincinnati says
that party of Capitalists from that
city, Philadelphia, and New York has
secured possession of tract of land
along the st. Johns and Indian rivers,
eighty-three miles long and from three
to six miles wide. The land is to be
drained at an expense of "a, 900, 900, and
devoted to the cultivation of sugar,
enough of which can be grown on the
strip to supply all of the United States"
According to Science the snail is
very prolific. Assuming that the repro
ductive season extends from March to
September, and assuming further th..t
the snail lives but two years, we have
the following estimate of the total num-
Der of the offspring of a single pair: At
the close of first season, 1900; $50 pairs
at close of second season, 1905, 900; or
iginal pair at close of second season,
1900. Total number of offspring in
two years. 1,s0S, 500.
Since 1850 the government has is
sued an annual report of strikes Be-
tween 1896 and 1880 according to the
report, l ,491 important strikes occurred,
besides many times that number of
smaller ones From January l, 1881, to
December -, 1856, there were 5000
strikes, involving 1923, 203 men and D.
S04 business firms. In the last-named
year We're 1900 strikes that caused a
wage loss of 81, SIS, 1911 to the men and
s., 600, 900 to the employers.
The kaleidoscope is of wonderful
assistance in geomstrical drawing. The
portion of the geometrical designs en-
ployed in art and architecture are cop
led by the artist from the figures pro-
duced by the Kaleidoscope. The instru-
ments employed are somewhat larger
than the toys sold in the shops, and
some of them are fastened upon stands
in such way as will enable the
in the same position for considerable
length of time, and thus give him an
opportunity to make copies of the
figures produced.
M. du Haudray following the method
of Prof. Carriers studies of the Simian
language has carried his photograph
into the hencoop. He places it in one
henhouse where the family are at
home, and when the receiver has been
eackled into for half an hour it is taken
away, and made to repeat all the gossip
in neighboring hencoop. The results
of the experiments are said to be mar
vellous Academei des Sciences is
awaiting lecture on the subject with
the greatest interest.
Scientists have measured the thick
ness of the envelope of soapy water in
closing the air of the bubble when it
becomes so thin as to produce rainbow
tints. AT the appearance of the shade
of violet it was one-fourth the thickness
of the length of an ordinary violet wave
of light-l-6O, 900 of an inch-thus
making the thickness equal to 1-24, 900
of an inch. As the bubble continued to
expand black patch formed adjacent
to the pipe from which the bubble was
being blown, and the thickness of such
patch has been found to be only LAO of
the thickness of the violet section, or
about IL, 900, 900 of an inch.