The Indiana State sentinel. [volume] (Indianapolis) 1868-1895, 1881-06-01
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According to Mr.. A. Renvuard, the water
in which hemp has been stepped produces
no evil effects on the health of a district
when such water is allowed to flow into run
ming water, but always destroys the fish and
some varieties of vegetable growth.
Two eggs of the extinct great ank were
recently sold by auction in Edinburgh,
both being purchased by Lord Lilford-one
at fl00, the other at 102 guineas-probably
the largest sum ever paid for a single egg,
with the exception OF that of the mos, a
specimen of which was sold at the same
place in 1865 for 600.
Ivory is readily rendered quite flexible
by immersion in a solution of pure phos
phoric acid Specific gravity 1.13) until it
loses, or partly loses, its opacity, when it is
washed in clean cold water and dried. In
this state it is as flexible as leather, but grad
ually hardens by exposure to dry air. I'm
mersion in hot water, however, restores lis
s~oftness and pliancy. The following method
may also be employed: Put the ivory to
soak in three ounces nitric acid mixed with
fifteen ounces water. In three or four days
the ivory will be soft.
curious experiment in heat is performed
with an apparatus devised by DIR. Grassi.
Il l6 dpDdTdluS COuclcbS Vi IuT6c COICtuLIlC
vessels, separated by ~annular spaces of
three-fourths of an inch, The outer space
is filed with oil and the inner with water.
The oil is heated to a point above 2120 Fab
renheit, when the water begins to boil. Oil
heated to 300o is then introduced into the
central vessel, and falls rapidly TO a te-1per-
ature about that of the boiling water. DR..
Grassi finds that this central oil cools the
more quickly the greater the heat of the
outer ring of OLA result seemingly very
paradoxical.
Speaking of the formation of mountains,
Professor Favre, Of Geneva, has said that
the three systems which account for the orr
gin of mountains do not differ greatly from
each other. Those who admit the system OF
elevations as the principal cause would prob
ably admit the formation of depressions as a
secondary cause, while those who give de-
preston the first place would also admit ele-
walton as a secondary factor, Lastly, in the
system of lateral crushing there is a general
depression of the earth, since there is a
diminution in the length OF the radius of the
globe, and yet there result elevations of the
ground in the midst Of this general depres-
sion.
Experiments made by NJ. Leloutre on the
transmission of power by betting, disclose a
curious fact, namely, that while the elonga-
tion or successive increments Of length be-
come less and less up to q certain load, they
then become greater and greater, showing a
point of maximum power of resistance
which is then followed by a falling off.
After this decline of resistance the elonga-
ton again becomes less rapid up to the
breaking strain, on approaching which the
resistance is generally greater. Practically,
in the case of ordinary leather, the maxi
mum resistance to stretching is met with at
a strain of about S50poundsp per square inch,
while in India rubber and webbing 1t occurs
at rather q lower strain, the fact appearing
therefore that the working strain on a belt
should be fixed as near as possible to that at
which the maximum resistance to stretch
ing is known to occur.