The Wallace miner. [volume] (Wallace, Idaho) 1907-current, 1914-11-19

4
It is extremely dangerous to remove
any part of the charge with a scraper
or other metal tool A stream OF water
may be used with safety for removing
the stemmIng. Some miners place
piece Of paper over the first inch or
two of stemming. Then, in case OF a
misfire, the part of the stemmlng
above the paper may be removed with
safety. In nearly all cases 1t Is safer
to drill and fire another hole about !
two feet away from the misfire
Thawinn Dynamite.
In many large mines dynamite IS
thawed carefully and given to the
miner ready for use, but at small
mines and prospects the miner often
must do his own thawing. No dyna-
mite thawing device should give q
Temperature higher than 100 degrees
r. or one-half as hot as boiling va
ter. in the part Of the thawer where
the dynamite is placed. 1t Is danger
Gus to thaw dynamite in current OF
live steam, on boiler, before an open
fire. in a stove oven or upon any neat
ed metal surface in boiling water, or
against the person Underneath the
shirt. Small quantities of dynamite
may safely be thawed in galvanized
iron pail. Most such thawing pals
are square and contain number OF
water tight tubes for holding the dy-
Mantle sticks. Hot water is poured
into the pail and the cover put on 70
retain the heat The water should
never be heated after having been
poured into the pail This type OF
lthawer will thaw ~ to "a sticks of dy-
Mantle at a time, and may be bought
at small cost.
Another method which is used for
larger quantities of dynamite Is te
bury box Of dynamite in a bed Of
manure. The cover may be a board
with a pipe as a handle; the pipe VIII
serve as a ventilator The manure
should be replaced by fresh manure
from time to time.
Blasting by Electricity.
Blasting by electricity, although
safer than blasting with cap and fuse,
has not vet come into general use in
, the metal mines of the United States.
At present it is used chiefly in shaft
; sinking. If electrical blasting were
used exclusively in shaft and Wine
sinking, many accidents from explo-
sives would be avoided. A knowledge
of the principles involved and of the
: equipment used Is necessary for safe
} and efficient blasting by electricity.
Electric Machine for Blasting.
Whatever the type of blasting ma
. chine used it should be carefully
studied until thoroughly understood,
5 Instructions for the care of the ma
: chine should be followed closely. The
? rack bar and end bearings Of the spin
die Of most blasting machines should
] be oiled from time to time, but no oil
e should be allowed to come in contact
with the commutator, A machine that
has been idle for some time may give
: weak current, but the current can
e usually be brought back to its original
e strength by working the handle up and
e down several times. Sometimes the
= machine can be made to act more
t quickly If the binding posts are con-
D nected by piece of wire or metal
s placed over them while the handlebar
I, bason ,,,orlyad IN npd dnuyp
The leading wires to work well
should not have too many spices in
n them. If it is necessary to splice the
e wires, the joints should be well sol
Y dered Weak spices tend to increase
t the resistance, so that more current is
] needed for given number Of shots.
r Electric Decorators.
i An electric blasting fuse electric
detonator) consists of a decorating
o cap containing the usual charge Of
I illuminate of mercury, and the fuse
= wire that is sealed within It, 1t is ex-
= ploded by the heating of the fuse wire
e when the electric current is sent
through it.
e There are various ways OF inserting
9 the cap into the dynamite cartridge
k but the most approved method is that
} shown in figure T. Any method that
= is liable to kink the leg wires should
r be avoided as it Is possible that the
a fuse wire within may become broken
= Punch a hole in the top of the car
r fridge with wooden or brass skeweI
e and push the cap we'll down. BY press
ing the dynamite around the top of the
cap 1t is protected from dampness. The
2 paper of the cartridge is then tied
t When blasting in wet places the leg
4 wires should be well covered with
e tape. Blasting caps are highly sensi-
t tive to heat, shock or friction and
r should be carefully handled. 1t is
e dangerous to attempt to pull the leg
' and fuse wires out of the cap.
: Operation of Electric Blasting Machine
!, The first step in electric blasting is
From Falls Of Rock or Ore, Explosives /;
United States During the Calendar VI