The Cheyenne daily leader. [volume] (Cheyenne, Wyo.) 1870-1884, 1881-07-22
SCIENTIFIC AND USEFUL.

II lie considered oy Nj. Psr'f9e that il
ia almost certain that tho ancient Eryp.
tians and P~h1niclans used steel. IL, in.
deed. they did not make it.
Tho Belgium Telephone Compan,
have mrde arrangements 50 that any O.
the subscribers leaving word any even
Ing. may be awakened mt any hour e.
next morning by means of u powe.fu
alarm.
DIR. ". Reiglcr says that tic quanli,,
OF rain water which finds It's way 4,
the ground along the trunks ui ir,t.- i.
very considerable. but that some l.inds
Of trees discharge this function better
than others.
1t is maintained by Prof. +. Wool.
ney than soil hcaped up arourul plants
has, during the day. a higher tempcra-
ture than earth not so treated. During
the night the billed earth becomes
colder. The explanation advanced is
that earth which is heaped up around
plants dries much more rapidly Than
level soil.
From the success which has already
attended the introduction of electric
clocks, and their evident utility for
railroad, postofiice. and telegraphic
Offices. DR.. NJ Hipp predicts that in a
few years every town Of any Importance
will have its time regulated by cleo
tricity, just as 1t has its light by night
supplied now by mean of Illuminating
gas.
Writing about some phenomena of
optics, M. Treve mentions the fact that
the fame Of lamp appears brighter,
and that an upright post, shaft, OF mast
Is 9 more distinctly through a VERT.
cal than q horizontal slit, but that a
house. q landscape, or the disk Of the
sun or moon is better observed when
the slit is horizontal. Photographs pre-
sent moro or less clear definition accord.
ing as the light passes from the kind Of
OBJECT exposed to the sensitive plate
through an opening or slit of a horizon.
tai Oh vertical nature. The results are
ascribed TO the action of diHused light.
A calculation has been made by some
arithmeticians of the extents to which
steampower has been developed. En-
gland derives from her wealth of coal
1900, 000-horse power; the United
States, $500, 900; Germany, 1000, 900;
France, 5000. 900; Austria, 1900, 600.
These figures do not include tho loco.
motive force-which. taking the mum.
Der Of locomotives in both hemispheres
to be more than l05, 900, and the milo
age 222, 900 miles-must have 80, 000,-
000-horse power. All the machines
and engines worked by steam in the
world Is estimated Mt 80, 900, O0O-horse
power. Each horsepower Is equal at
least to the strength Of 10 men, and the
steam power Of the globe represents a
daily working power Of 100000. 900
men.
DR.. Lenz has found that Timbuctoo
has now only 10000 inhabitants, and
that many OF its brick-built houses
have fallen In decay. But the town
yet contains many schools aud rich
libraries, besides not q few learned men
capable Of holding extremely interest.
ind dialectc discussions, especially on
doctrines Of the Koran. The old canals
which formerly connected the place
with the Niger, distant only about SIX
miles, are now morely o series Of lakes.
His notes regarding the Sahara are Of
Importance. The .sGrcat Desert Is in
no part below sea-level, and Il aplnteau
more than 900 feet above Underwater.
Hero anc there are hills Of granite,
plains sand, very shallow lakes,
and pa. Of great fertility, and there
arc vsn beasts Of prey. The Sahara
Of tho ..ood Of stu young men u
rapidly losing It's romance Of terror
Under the influence Of tho moro recent
acQ9pr Of actual exploration.