TM 9-1375-213-12
guished from the 8-second delay percussion deto-
in an enclosed space (boxcar or unventilated
nator ((3 ) below) by the markings on the surface
warehouse) containing powdered dust such as
of the delay housings and by the shapes of the
coal, flour, soap, aluminum, or magnesium pow-
pull rings. The 15-second delay percussion detona-
ders.
tor has a circular pull ring. Twenty-five 15-second
e. Detonators. Detonators are mechanically
delay percussion detonators M1A2 are packed per
actuated explosive devices and are used to deto-
carton, 8 cartons (200 detonators) per wooden
nate explosive charges. Detonators combine the
box or 10 detonators per carton, 1 carton per bar-
functions of firing devices and blasting caps in a
rier bag, 5 bags per carton, 4 cartons (200 detona-
single unit. They may or may not incorporate a
tors) per wooden box. The weight of the box with
time-delay mechanism. Detonators used in demoli-
contents is 75 pounds.
tion work are classified according to the initiating
action as percussion, and concussion.
(3) Detonator, percussion: M2A1, 8-second
(1) Detonators, percussion delay. Delay per-
cussion detonators are devices for detonating ex-
marking, and the shape of the pull ring, the 8-
plosive charges after a definite period of delay.
second delay percussion detonator is identical in
The initiating mechanism, delay system, and
construction, functioning, and use to the 15-
blasting cap are all integral parts of the unit.
second delay percussion detonator described in
These detonators are used for short delay firing of
(2) above. The 8-second delay percussion detona-
demolition charges, particularly during assault
tor maybe distinguished from the 15-second delay
demolitions, They are suitable for underwater
percussion detonator by the markings on the delay
use.
housings and by the shapes of the pull rings. The
(2) Detonator, percussion: M1A2, 15-second
8-second delay percussion detonator has a T-
shaped pull ring. Ten 8-second delay percussion
detonator M1A2 consists of a firing pin assembly
detonators M2A1 are packed per barrier bag, 6
joined to a delay housing and primer holder as-
bags per carton, 4 cartons (200 detonators) per
sembly, with a special blasting cap crimped to an
wooden box. The weight of the box with contents
integral coupling base on one end of the delay
is 75 pounds.
housing and primer holder assembly. The 15-
f. Firing Devices. A firing device is designed to
second delay percussion detonator may be distin-
