The Red Cloud chief., 1878-02-14
The WORLD or Science.


lbsS h8St . p1oe ana
4 porsioo -! mountain Stream 20 them
and are - walled in that they
ran not escape from the domain. Al
ready they have built three dams. and
have cut down many Of the trees IN
their park. Willow houghs are gwen
them for food. in addition la what they
can themselves secure They have
brei in their mw home. and sem ID b~
flourishing.
Recovering Lost (kui~kse1ver.
The beds VI rivers in our gold min
ing districts. where the amalgam pro-
Co.'S has been long employed. are chsrc
ed with quicksilver. Some German
have devised . method for recovering
q portion ST the los, metal. anal accord-
ing to the Virginia City Enterpris'. =
fair days labor is quite remuneraied bS
the xmalgam or mercury obtained. A
tool Ut iron is USED. about ten feet long.
with . copper head shaped like n sol
dering-iron. On the sides 81 this tool
there are pockets. The hesd Is thrus,
down into the river bed and churnci up
and down. After = while anaIgam 4,
found in the pockets 81 the tool, or AL
herring To it, surface. and Is scrap.d on
by the workmen.
elias. Type.
La Patrie reports favorably "n some
French experiments to substitute har-
dened glass for type metal. IL is stated
that the type founders moulds aud ma
chinery can bc used without further
change. The new types. made of glass
preserve their cleanliness almost ndef-
~initely; they are said ~ wear better
than metal. and they can be- cast with u
sharpness Of line tina, will print o
distinctly than is possible with the old
type. There will be also the advan-
tage of an absence Of half-defaeed let
tiers, since il Is apeculiarity OF the hard
ened glass that rs q O ~ i, is broken
at all, il crumblcs altogether. But ~
transparency will not be required In
glass used for this purpose. 1t is be-
lieved that a toughness extraordinary
even for the hardened glass can be Sc
cured.
Photography by Artificial Light
The London Times speaks IN terms o!
praise Of the success OF Mr.. Van der
Weyde in producing photographs by
means Of the electric light concentrated
BY a Fresnel lens placed at the opening
Of the reflector. The light is said To bc
soft and pleasant; il can be thrown up
on a sitter in any position: the picture
is taken in eight or ten seconds. While
EXPERIMENTING, before he attained hi,
present success, Mr.. Van der Weydt
used mt one time n globe OF water tn
concentrate the light; this apparatus
gave wav under the weight 1T the water
and SO injured the inventor by spiinters
Of falling glass, that he was disabled
for two months. Mr.. Van der Weyde
is an American gentleman. the son OF
the editor of the Manufacturer ana
builder, of New York. He has Won
distinction abroad a. an artist, the paint
ings having been placed on the line al
the exhibition vi the Royal Academy.
| In n patent taken cut for his use of al
iuncts TO photography. Mr.. Van del
Wevde has left open To all the world
the employment of the invention fol
medical and surgical purposes. such As
hospital operations, which often reinir,
the brightest light thrown at a special
angle.
Pennsylvania Tornado.
A pamphlet has been published 10y
Richard Darlington. jr.. giving a pre-
| else and careful description of q yer!
destructive tornado that passed over TN,
west half of Chester county, Pa. july
l.. Two illustrations serve to SHOW the
! outward shape of the tornado. and ths
character Of the damage inflicted. The
| weather, before the advent of the tor
nado, was oppressively close; the ther
mometer stood at 95 degrees. the bar
| ometer 29.6. The direction of motor
was for the most part nearly east; ths
track was from 100 to 800 yards wide
| and twenty-five miles long. The tor
nadO moved along the track from nv
to fifteen miles per hour. averaging
about twelve. IL formed a cone. Oh
which the upper portion kept a very di.
| rect course, while the lower swervcd ir
regularly. Little rain or hail accompa'
MED it, and in parts of the track the
sun was shining. A roaring sound &C
cOmpanied it. The trees which IT pros
trsted we're thown with their heads &c
the north, so that they lay at right m
| giles to the route. the whirling motion
being from right to left. The greatest
destructive power was constantly ex'
hibited on the right side OF the revolv'
ing axis. The trees were twisted be-
fore being broken off or uprooted. Al
| ter it had gathered sufficient materia
from the ground its appearance wa
| like the conventional pictures Of water
| spOuts-small at the 6aee and widening
toward the sky. The interior Of thi.
storm-cloud seemed to be full Of flying
missiles. and these were also discharged
| outward in every direction When j
passed over q stream of water. all thu
water went up in the tornado. and thu
bed of the stream was left dry. Ihs
destruction of property, on . careful e.
| innate, amounted To about $4,000. A
man was carried by the tornado abOu'
| 200 yards, and dropped. in an uncOn
| sciOus state, with his shoulder fracturet
and his Jaw broken: several farm ami
mails were also much injured Mr.. Oar
lington's compilations II . serviceabla
work. since little is satisfactorily ascer
| tained as to the aus of such lorna
| does, xnd the only hope Of fully under
standing them is in obtaining q more
precise knowledge of their characters
tics. In recent essays on the genera
subject. NJ. Faye. Of Paris, . distin.
guished m~eteOrologist, hss propoundet
opinions concerning tornadoes and wa.
~ter-spouts that sse widely az vsrianol
with the views heretofore generally &C
cepted. and his essay has consequently
evoked . lively discussion in scientific
circles. ~