Amador ledger. (Jackson, Amador County, Calif.) 1875-19??, 1909-01-15

tinel for Ships.'-Rotation of For
ests.--A Wonderful Lathe Auto
maton. The Burrow of the Human
Ant. A Pulse Recorder. Making
Kinship Closer. Art in Grinding.
new theory of gold bearing
alluvial deposits has been worked
out by M. Fieux, French geologist.
1t has been usually assumed Lthat
gold sulphide and telluride In the
earth's central nucleus have been
dissolved in hot springs aud after
wards deposited with Relatinous
silica, and that erosion of the auri-
ferrous quartz veins thus formed has
given the alluvial strata containing
metallic gold. This proves to be true
in some cases. More often, however.
the gold in the deposits is associated
with basic rocks like diabase or dio.
rite instead of with silica, and rea-
Sous are found for concluding that,
in general, heavy eruptive rocks
have brought up some of the metallic
gold from the earth's interior, Fand
after oxidation and erosion the
lighter materials of these rocks have
been washed away, leaving the
heavier portions, including,the gold.
Drinking tumblers made of ice we're
first tried IN Holland, where they
are considerably used in hot veather.
They are made by pouring a little
water into a metallic outer mold, in
Producing a well-centered inner form,
and plunglng the whole into treez-
ing mixture. The early tendency to
break at the bottom has been lem edi led
by shaping the molds so that the
bottom is made thick and curved up
ward. On taking from the mold,
the cup is given an external wrapper
of parattined paper for protection in
hanling, and is then placed in cold
alter storage until wanted for use.
Anthropologists are finding that
there are odors peculiar to races as
we'll as individuals. Dogs quickly
recognize the individual odor, but
our dull sense of smell seldom per-
ceives it. Negroes and Chinese notice
in the white man the odor of death.
Herve records that Negroes have
marked odor of goats; and Japanese
and Chinese are said to have odors
so distinct that it has been possible
to tell by the smell whether a dis
patch box came from Peking or
Toxic.
The automatic gas lookout OF Ar
mold Philip and Louis j. Steele, two
British marine engineers, is designed
to detect leakages of combustible
vapor or gas in submarines OF the CON
fined spaces of larger vessels. The
presence of gasoline vapor or danger
Gus gas IS shown when the proportion
is only third of that required to
form an explosive mixture with air,
and warning is thus given in time to
prevent accident. The apparatus in
cludes an electric motor air pump,
with small pipes through which air
is drawn from all parts of the vessel
where oil or gas leaks are likely to
occur. When the air sucked In CON
tains any considerable amount of IN
flammable vapor or gas, white light |
goes out and red light is lighted,
and at the same time an electric bell |
is sounded. An indicator also shows
the pipe through which the contain
mated air has been drawn.
The necessity of the rotation of |
crops is we'll recognized among
modern farmers, and now it appears
that in India Nature is seen practic-
ing the same thing in the forests. |
The sol becoming exhausted after a
long period of one kind of for est, !
seedlings Of other species gradually
replace the old trees as they die out.
On the Indian soil, the deodar tree
has been observed taking the place of |
the blue pine, pine and oak slowly
exchange places, and spruce and
silver fir have been noted gradually
extending into a forest of falling
oaks.
The balance or compromising screws
for the balance wheel of a watch are
about 600 inch in length, have a head
00.5 inch in diamater, an the threaded
part is 0 OPS inch IN diameter, with
800 threads to the inch. These are
probably the smallest screws made by
automatic machines. Brass wire of
the proper size is supplied, and from
this one machiue makes about 600