The Caldwell tribune. [volume] (Caldwell, Idaho Territory [Idaho]) 1883-1928, 1913-06-06

e MODERN AUToLoAoiNo RlFLE&
The machines for drilling ana boring
are the best that money can buy and
the operatives the most skillful to be
found anywhere. Care at this stage
! reduces the necessity for Strengthening
later. Every point Is given the minut-
est attention. In drilling % calibers,
for example. the length of the hole
must be from 100 to l25 times the d.
ameter Of the drill
Taking OF e. 1000 Of an Inch.
The boring Is an especially delicate
task. In chokeboring your shotgun,
for example. the final reamer took OF
only 2-1OOO Of an inch. Think of such
! a gossamer thread of metal! But it In.
sures accuracy
Looking At Reflected Limos.
But here is the inspection depart
ment. Hanging In the windows are
translucent frames with a black line
across the center Of each. You will
see one of the inspectors take a barrel
from the waiting rack. hold one end
toward the light. squirt critically
through the tube and lay it aside ap-
provingly
You pick 1t up and follow his exam
pie. First you point 1t straight at the
black cross line on the frame. Then
you tip up the farther end ever so lit
tie and see how two reflected shade
lines form on the shining inner surface
and run down the barrel toward your
eye. These lines are straight as a die;
therefore the barrel Is perfect. Should
either one waver the slightest fraction
the Inspectors quick eye at once de-
tects it,
There are 24O inspection points and
ol7 gauges must be used-forty- whine
on the guard, forty-six on the receiver.
thirty on the breech block, and SO on.
On the receiver for the No. 10 repeat.
ing shotgun. however, seventy gauges
are used, and thirty-one for the trig-
ger alone.
Beyond the Power Of Sight.
Some Of these gauges are marvels of
delicacy, but there is one machine used
which perhaps has never been equaled
Not only will 1t make measurements
to one twenty thousandth of an inch.
but 1t Is actually sensitive to differ
ences Of ONE HUNDRED THOU
SANDTH OF AN INCH. Such a mi
mute dimension we cannot even
imagine. 1t is beyond the range of the |
most powerful microscope, and yet
here is a piece of mechanism which
can really detect it
Testing With Loads.
First, then, is the barrel as perfect as
we believe It? We know that it Is
perfect In gauge and workma nship,
but is there the slightest chance Of an
invisible Jaw In material? The origi.
nal tests Of material made this very.
very unlikely, but we will take no
chances. II there be such a aaw 1t
must burst at more than double the
service charge.
Accordingly the gun Is laid in q rest
with its muzzle pointed through an
opening In the wall into a bank Of
sand. We get behind a steel plate for
safety and put cotton In our ears. The
".
Bang! The gun is uninjured, Its
strength has been assured.
Then follow tests for action and
speed. and II the gun be an auto load.
er the swift rattle of Its discharges is
surprising. The well gagged parts
move as smoothly as the works of a
watch And finally there are the tar
get tests
Firing at Targets.
Rifle after rife In succession Is laid ,
in rest and fred at mathematically
divided target upon the hillside
The results are noted through a tele-
scope. Difficulty at this point invaria-
bly, rejects the rife
Shotguns are discharged at paper tar.
gets In the shooting gallery. We walk
through the hallway that runs outside |
to the point where a boy IL hasdling |
the targets. We hear q distant bang.
The boy pulls a handle In the side Of
the wall and frame emerges bearing
q well peppered sheet Of paper. This
he unfastens and hangs up for refer
ence. ptnning fresh sheet in its place.
= uCSS s0ASCsS uuSI uh Uc cAouAu00
and every shot hole be counted. II In
any case there be found less than Is
per cent Of the shot within a circle Of
tnkxty inches from the center the gun
u at once rejected.
Here We ana, long way from the
cave man. thousands Of skilled me-
chanics producing arms and ammuni-
ton very different from the thrown
missile Of the stono age And the part
played In the wars OF the earth has
given way largely 70 the serving Of
peaceful hunters aud marksmen.