Amador ledger., 1909-03-05

the era-stereopticon of Andre
Uheron, French experimenter. All
successful pictures Of this kind so far
have depended on the "thre color
process. in which three negatives
are made under screens of the three
primary colors, and the three
pictures are in some way superposed
or comb mbined so az to be seen in a
single view. The new apparatus is
small camera divided into three
compartments arranged in triangle.
Three object lenses of equal focus are
placed In front of the partments,
and each is provided with an appro-
pirate colors screen. With lens of
proper focus fitted into a ring that
surrounds the three obiectives. three
different single-color negatives of the
same object are taken on a single
plate. 10 project the views, a posi-
tive is inserted in place of the mega
tive. strong light is thrown upon
the plate from behind, and a suitable
lens in the ring around the three OBJ.
jectives concentrates and automatlcaI-
ly superposes the three images on a
projection screen. Though there is
some slight blUrring, the colored
pictures SO obtained are brilliant and
pleasing.
Ferro-sillcon, now coming into ex
tensive use as ready means of add
ing silicon to certain grades of steel,
is produced by heating IN the electric
coke and lime. When wet it gives off
much phosrhoretted hydrogen, arse
niureted hydrogen and other gas, and
the death of I've Russian immigrants
last December, while passengers In
the steerage Of a steamer from Ant
werp to Grimsby, has been traced to
poisonous emanations from a cargo of
this material.
An arrangement of ships lights
ia definite triangle on a known plan
is urged by d. FL. Shuttleworth-
ion. The lights would then show
an observer on another ship the
vessels course, her distance from the
observer, and her approximate speed.
Not least interesting of accidental
discoveries is the new method of
rapidly converting metals into ribbon
form. which was hit upon by Mr
Gilbert, British chemist, while
seeking some way of making white
lead without handling. The molten
metal is dropped upon a rapidly re-
voIving drum filled with cold water,
and from the surface of the drum it
shoots out at the rate of twenty miles
1900 to 1000 Of au inch thick, so
cooled that it can be caught In the
hand. In this way metal ribbon can
Reproduced at an expense of So. % or
$40. 90 ton, or perhaps a twentieth
of the cost of making zinc turnings
by the old method. Numerous ap-
lead will take the place of lead shaw
iugs or turnings for packing joints
and bearings and other purposes, zinc
ribbon will probably be useful in the
cyanide treatment of gold ores, and
in chemical industries various metals
will be brought into solution more
quickly when first made into ribbon
firm.
A new dwelling proposed at the late
hyRienio congress in Berlin is to have
each successive story narrowed from
three to six feet, with several feet of
balconies to widen the terraces thus
formed. This plaE, recommended
particularly for sanatoriums and
houses for the poorer people, provides
an abundance of air and light for
each story. and supplies an open
space for recreation ont of doors. AS
u material for bindings of this kind,
reinforced concrete has hygienic aud
other advantages.
The United States is wearing down
at the average rate of one inch In 760
years. This result is computed from
twenty years of stream gauging and
water analysis by the Geological Sur
vey the Engineer Corps Uf the Army,
and the Weather Bureau, supplement-
ed by some state and municipal work.
The streams carry off each year an
average of 81 tons of dissolved solids
and 166 tons of suspended matter for
each square mile of surface -equival-
aok 70 A total ~ L7O non OO0 TONS oF