TM 9-1375-213-12
M1 is a chemically-timed mechanical device used
initiate a train of fire or detonation of demolition
for delay action firing of mines or demolition
charges, boobytraps, or mines, principally by
charges. The device consists of a two-part case or
action on a nonelectric blasting cap or mine acti-
tube, the parts being joined near the center by a
vator. It is a separate item of issue. Firing devices
coupling. The tube is about 3/8 inch in diameter
are of two general types, the tubular type and the
and the device is 6-inches long including a
box type. The tubular-type firing devices, consist-
primed coupling base, which is not removable, but
ing of head, case, and coupling base, are arranged
has the same size thread and nipple as on all re-
for actuation by pressure, pull, or release of pull
movable firing device coupling bases. The half of
according to the design of the particular model.
the case attached to the coupling base is brass and
The box-type firing devices, consisting of a rectan-
the other half is thin copper, capable of being
gular steel body and coupling base, are arranged
crushed between thumb and finger. The copper
for release of pressure, The coupling base, fitted
half contains a sealed glass ampoule of corrosive
to all types, contains a percussion primer.
chemical and the brass half houses a firing pin
(1) Firing device, demolition: M1, delay-type
and spring. An identification and safety strip ex-
