Wauwatosa news. [volume] (Wauwatosa, Wis.) 1900-1948, 1905-12-16
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Populef: 5ience.

100 towns in France. The gas is
made from calcium carbide. In 1909
the consumption of the latter was
1850 tons.
The power generated in a modern
steamship in single voyage across
the Atlantic is more than enough tn
raise from the Nile and set in place
every stone Of one of the great Egyn-
tan pyramids.
Aluminium is difficult metal TO
tool, as it clogs the cutter 1t also
shows a tendency to split and check
on bending. Some of it's allows. as
that with magnesium and called
magnalium," are said to be easily
workable.
A new type of submarine torpedo
boat is undergoing tests in England.
The boat is only 81 feet long by 6 feet
. inches in diameter, aud can be car
rled on the deck of a battleship, and
launched when it 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 a for
est reserve of 100000 acres, Yield
ing yearly revenue of at least S3O.-
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 lis OF. Some of the
high efficiency fans throw over 1885,
600 cubic feet of air q minute. This
means volume equal to a cube over
80 feet on side, and an actual
weight of more than u tons. The
weight is not striking, but the vol
ume required to gather this, together
with the friction and the heat Of
compression, all comprise a mechan-
ical condensation Of great signif-
canoe.
Reflected solar heat is used to OBJ
tain very high temperatures in a new
furnace designed by a French invent
or. With it he expects to obtain
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 30 feet, at the base
IS feet and the depth So feet With
a previous and much smaller furnace,
constructed on similar lines, temper
allure of 1000 degrees c. was OBJ
tanned.
Geographers representing the prin-
cipal nations are at work upon map
Of the entire earth on scale Of ] to
100000, and Professor Penck, the
German geographer, reports that 80
sheets out of 437 planned had been
completed up to March last On this
map the United States will cover an
area nearly Is feet long. A distance
of one mile will be represented by
space about Onesixteenth of an inch
long. There are, of course, many
maps of small areas on much larger
scale than this, but to represent the
whole face of the known world on
this scale is an undertaking of much
interest.
The 50-ton steel car has now been
in use about eight years and it would
appear that 80 tons are the limit Of
capacity. This is not likely to be in
creased in the near future except for
special purposes in narrow territory.
There are two principal reasons for
this, which were pointed out by C. A.
Seley in a recent address at Purdue
University. The first is because the
weight on the adjacent trucks Of two
loaded 50-ton cars, when coupled, pro-
duces a wheel load on track and
bridges which is equal to that of
very heavy locomotive. The second
reason is that castiron wheels have
about reached their safe limit of
strength in carrying 50-ton cars. 1t is
not advisable to increase the number
of wheels under a freight car. and no
substitute has been developed which
can be produced at a reasonable cost.
Names Champion Elm.
One of the champion elms of Maine
stands in Hallowell It's grth is II