Amador ledger. (Jackson, Amador County, Calif.) 1875-19??, 1906-08-24
SCIENTIFIC
MISCELLANY
Reported weekly for the Ledger.
improved Life-Saving. Museum OF
Accident Prevention. = Singular
Alteration of Metals. = RadIum
Poisoning. = Enciusted Rocks
Summer Glass. = Disc Cinemato
graphs. BlowpIpe Progress. Con
sumptives Clothing.

Artificial respiration in the appar-
emily drowned Is usually set mp by
tiexion of the arms of the PROSTATE
patient. Seeking more positive and
better action, DR.. Eisenmenger, of
Szaszvaros, Hungary. has developed
the new plan OF alternately raising
and depressing the abdomen, and be-
lieves that this is much more effec.
tive method of resuscitation. His
simple apparatus is kind of cuirass,
which is strapped to the body and
made tight by an edge pad, with a
foot bellows for alternately compress
ing and exhausting the air. The alb
domen promptly responds to the pres
sure in the cuiIass, and this gives
not ouly vigorous inspiration and
expiration, but also gentle heart
massage, the combined action tending
to give favorable results even in
desperate cases.
The permanent exhibition of acct
dent preventing appliances at Char
lottenburg is to be supported by an
annual grant of $4,000 marks. 1t now
contains lis large machines with 600
smaller appliances, and 10 electric
motors supply driving power. Acct
dent preventing parts of machines are
painted red, while dangerous parts
are blue. Workmen's clothing, eye
protectors, safety catches, door locks
and speed brakes are shown, with
safety devices for lathes, presses, cir
cnlar saws, etc. Safety scatfolding is
placed on the grounds, while gallery
gives lessons in preventing industrial
diseases.
Aluminium, cadmium, zinc, magnes-
ium, etc., effect the Photographic
plate, though not classed as radiu-
active. a late IemaI kable observation
is that the electric spark sometimes
increases the effect, sometimes lessons
1t, while this nfiuenre-though SO
superficial that slight sandpapering
removes it-persists for months.
The physiological effects of feeble
radio-activity have been subject of
investigation in France by 4. S. Lon
don. Using quarter of grain of
| radium, he applied this to the fore
arm for brief intervals, and obtained
a distinct reaction after a minimum
exposure of 10 seconds. He suspended
four grains OF Iadium bromide in a
cage about Is inches long by Is wide
and l. high. Three rabbits confined
in this cage showed redness of the
ears after 10 days, while burns soon
appeared on the backs, and after IA
months the backs and heads were de-
nuded of fur and covered with ulcers.
Movements had become apathetic and
slow, the hind legs being partially
paralyZed. The eyes were affected,
and postmortem examination reveal
ed changes and degenerations in the
muscles, liver, spleen, kidneys and
generative organs
The dark film sometimes found on
the rocks of rivers has been studied
by Cairo chemist at the Niles first
cataract. 1t is concluded that the
film, like that of desert rocks, arises
from material in the rocks them
selves. and that the depth of color
depends upon the amount of black
oxide of manganese contained, al
though silica tends to add to the
darkening. 1he film is formed and
preserved only in hot climates having
small rainfall.
Ordinary window. glass passes near
ly all of the heat coming from the
sun, although it intercepts dark heat,
but the new glass OF Richard SZig
mondy, an Austrian, is claimed TO
prevent the passage of niue -tenths of
the heat of the suns rays. This
glass would change hot house into
cold house. The advantages seem to
be numerous, but not least should be
the delighteful cooIness of summer
cottages having windows of the new
material.
Instead of the long celluiuid film,
London photographer uses circular
glass plates for the acknowledgement.
The pictures are taken in spiral,
and plate 10 inches in diameter
holds several hundred, recording a
story lasting about four minutes.
kecei researches have shown that
explosions in gases travel from one
end Of tGLe to the other at certain
definite speed. This has suggested an
important Improvement in the blow
pipe, and in the apparatus brought
out by the Societi l. Oxyhydrique OF
Paris the gases are mixed before
being lei t. the flame, explosion in
the tube being prevented by forcing
the mixture from the nozzle at a
speed eater than the rate of pro-
pagatio. Of the flame. The blowpipe
is very simple. 1t Is ordinarily
long conicsi nozzle with two open
ings al the Larger end, rubber tube