Amador ledger., 1909-07-30

wick, Gremany, magnets, alternating
current transformers and even dyna-
mos have been made to talk, with
out the use of vibrating plates or
membranes. A core of soft iron en-
closed in coil in miorophone cir
Quit was at the same time surrounded
bv second coil of wire traversed by
direct current, and was thus kept
constantly magnetized while subject
ed to the feeble variations of the
microphone circuit. Words spoken
into the miorophone we're reproduced
by the magnetized iron so loudly as
to be heard several yards. Trying
the dynamo, the field magnets we're
excited, by a special continuous cur
rent. and the microphone circuit was
applied to the brushes. Both speech
and song delivered before the micro
phone were reproduced by the
dynamo so clearly as to be distinctly
heard in good d-sized hall.
If the wind blowing over London
to height of sou feet could be har-
messed. Sidney Ransom estimated, 1t
would do work equivalent to that of
steam engine of half a million
horse power. working day and night.
Wind turbines can be used for many
purposes, are simple to erect, and do
not usually require towers more than
80 feet high. In Germany wind
power electric generating equipment
has been brought out. No attention
is needed except to reduce the sail
area of the wind wheel in storms. a
storage battery stores the excess cur
rent from the dynamo until needed.
and special regulator automatically
keeps at constant pressure the cur
rent supplied for housekeeping or
driving small farm or other machines.
Besides striking improvement in
stature and health, boys taken from
London streets tor the British navy
have shown remarkable change In
the shape and expression of the face.
DIR. Robbins curiously attributes this
development to growth of the lower
jaw brought about by the chewing
made necessary by the "salt junk"
and other navy ratious.
The theory that large comet
collided with the earth just $50 years
ago appears to Prof. W, Il. Pickering
as quite plausible. Geologists have
reached the conclusion that the now
famous crater near Coon Butte, ArI-
zona, is the scar left by great fall
of meteoric matter, and the fact that
seven of the ten largest known
meteorites have been found within
900 miles of this place suggests that
all have been scattered fragments
from the same fall. They are similar
masses of iron and nickel weighing
from three to twenty tons each.
Geological evidence at Coon BUTTE
indicated that the collision occurred
less than 5000 years ago, and stunted
cedars growing in the crater show by
their annual rings that the time
must have been at least 700 years ago.
Annals of Cairo, Egypt, seem to
place the date in August. 1929. The
record mentions great meteoric
shower, such as might be witnessed
over the earth on collision with a
comet, and there was not only a
brilliant light but great noise, IN
contrast with the stiffness of other
meteoric showers that have been
known.
The typo of powerful electromagnetic
that is being used in many English
hospitals for removing iron and steel
PARTICLES from the eye has core of
the best Swedish soft iron, three feet
long and six inches III diameter.
which is wound with 200 pounds of
insulated wire in two coils. The
threaded end of the magnet is adapt
ed to receive terminals Iof shapes
varied to suit special cases. Mount
ed on ball bearings, the magnet can
be moved easily in any direction;
and a special foTm-for reclining
patients-is geared so as to be tilted
by hand crack. A rheostat varies
the strength OF the magnet, which ut
the maximum, eXerts a pull of 30
pounds per square inch at distance
of one inch.
seismograph registering the iolts
of motor vehicle was a novel eS-
hibit by Hon X. q. Parsons at late
soiree CT the London Royal Society,
The apparatus consists OF weight