Elk City mining news. (Elk City, Idaho) 1903-1913, 1906-01-20
@-5S
PulssE''&Sienoe.



the consumption of the latter was
IL, 800 tons.
The power generated in a modern
steamship in a single voyage across
the Atlantic is more than enough to
raise from the Nile and set in place
every stone of one of the great Egyp-
tan pyramids.
Aluminium is a difficult metal to |
tool, as it clogs the cutter 1t also |
shows tendency to split and check |
on bending. Some of its alloys, as |
that with magnesium and called |
"magnalium," are said to be easily |
workable.
new type of submarine torpedo
boat is undergoing tests in England.
The boat is only "a feet long by feet
8 inches in diameter, and can be car
ried on the deck Of a battleship, and
launched when 1t is desired to bring
1t into action. 1t has a speed. when
submerged, of eight knots, carries two
torpedo tubes, and is navigated by a
crew of three men,
The government of Ontario Is ex-
pected to announce shortly a definite
plan of forest preservation, the ulti-
mate outcome of which will be for,
est reserve Of 100000 acres, yield!
ing yearly revenue OF at least $780,
100000. Under the proposed plan,
which applies only to lands not suit
able for agriculture the timber is to
be sold only as it comes to maturity,
and the trees that have attained prop
er size must be marked by govern
ment employees before they can be cut.
One cubic foot of dry air at ordi-
nary temperature and pressure weighs
about .074 h., or 1.1S OF. Some of the
high efficiency fans throw over 1885,
600 cubic feet Of air a minute This
means volume equal to a cube over
80 feet on side, and an actual
weight Of more than IL tons. The
weight is not striking, bat the vol
anne required to gather this, together
with the friction and the heat Of
!, compression, all comprise mechan-
} ical condensation of great signifi-
, canoe
: Reflected solar heat is used to OBJ
tain very high temperatures in new
furnace designed by French invent
or. With it he expects to obtain a
temperature of $500 degrees c.,
which is higher than that of the cleo
trio furnace. The reflector is built up
of more than 5000 mirrors arranged
side by side in parallel rows, each
measuring about 4x5 inches The
width at the top is 80 feet, at the base
IS feet and the depth 80 feet. With
a previous and much smaller furnace,
constructed on similar lines, a temper
allure of 1000 degrees C. was OBJ
tanned.
Geographers representing the prin.
cipal nations are at work upon a map
of the entire earth on scale of / to
100000, and Professor Penck, the
German geographer, reports that sc
sheets out of 437 planned had been
completed up to March last On this
map the United States will cover an
area nearly 16 feet long. A distance
of one mile will be represented by a
space about one-siXteenth of an inch
long. There are, of course, many
maps of small areas on a much large,
scale than this, but to represent the
whole face of the known world or
this scale is an undertaking of much
: interest
The 50-ton steel car has now beer
In use about eight years and it would
appear that 80 tons are the limit OF
l capacity. This is not likely to be In
creased in the near future except fol
special purposes in a narrow territory
There are two principal reasons fol
this, which were pointed out by c. A
n Seley IN q recent address at Purdue
: a University. The first 10 because the
weight on the adjacent trucks of two
a loaded 50-ton cars, when coupled, pro
8 duces a wheel load on track anC
U bridges which is equal to that of @
II very heavy locomotive. The second
c reason is that castiron wheels have
about reached their safe limit OF
f strength in carrying 50ton cars. 1t il
n not advisable to increase the number
=. of wheels under a freight car. and NJ
II substitute has been developed which
can be produced at reasonable cost
T,nnkfnX After the Present.