(1) This item consists of a continuous train of explosive or fastburning
material enclosed in a flexible waterproof cord or cable. It is used for
setting off an explosive or combustible mixture of powders by action of
the fuse flame on the material being ignited. Fuse cord can be initiated
by a match flame, using a specific procedure, or with a punk (like you get
with sparklers). Fuse cord burns at a uniform rate allowing the user to
be away from the functions.
(2) Fuse cord does not directly ignite any incendiaries listed in File 4 but
is a primary initiator for all igniters listed in File 3 except:
Potassium Permanganate-Glycerin Powdered Aluminum-Sulfur Pellets
White Phosphorus and Subignitors for Thermite
Blasting Time Fuse: This consists of powder tightly wrapped with several layers
of fabric and waterproofing materials. It might be any
color, orange being the most common. The diameter of this
cord is 0.2 inches (a little larger than 3/16 of an inch).
The fuse burns inside the wrapping at a rate of about 40
seconds per foot. It must be tested before use to verify
the exact burning rate.
Safety Fuse M700: This fuse is similar to the above fuse and may be used
interchangeably with it. The fuse is dark green cord 0.2
inches in diameter with a plastic cover, either smooth or
with single painted abrasive bands around the outside at
1 foot or 18 inch intervals and double painted abrasive
bands at 5 foot or 90 inch intervals depending on the time
of manufacture. These bands are provided to make measuring
easy. They are abrasive so that they can be felt in the
dark. The fuse burns inside the wrapping at a rate of
about 40 seconds per foot. It must be tested as above to
verify the exact burning time.
NOTE: A commercial item can be substituted for either of the above US Army
issue items. The commercial fuse is 0.1 inch (about 3/32 inch) in
diameter and is coated only with waterproofing lacquer. This fuse can
be easily ignited by holding the free end in a match flame because the
outside covering if flamable.
-Preparation
NONE.
-Application
(1) GENERAL
(A) Cut and discard a 6-inch langth from the free end of the fuse roll. Do
this to be sure that there is no chance of misfire from a damp powder
train because of absorption of moisture from the open air. Then cut off
a measured length of fuze to check the burning rate before actual use.
(B) Cut the fuse long enought to allow a resonable time delay in initiation
of the incendiary system. The cut should be made squarely across the
fuse.
(C) Prepare the fuse for ignition by splitting the fuse at one end to a depth
of about one inch. Place the head of an unlighted match in the powder
train.
(D) Insert the other end of the fuse into a quantity of an igniter mixture
so that the fuse end terminates near the center of the mixture. Be sure
the fuse cord is anchored in the igniter mixture and cannot pull away.
In case of a solid igniter material such as Fire Fudge, the fuse is split
to about one-half inch at the end opposite the end containing the match
in the powder train. This split fuse end is is wedged over a sharp of
the solid igniter material. Be sure the black powder in the fuse firmly
contacts the solid igniter. If necessary, the fuse cord can be held
firmly to the solid igniter with light tape.
(E) The fuse is initiated by lighting the match head inserted in the split
end of the fuse with a burning match.
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(F) Two standard fuse lighters, the M2 and M60 are available in demolition
kits for positive lighting of Blasting Time Fuse and Safety Fuse M700
under all weather conditions--even underwater if it is properly water-
proofed. The devices are manually operated. A pull on the striker
retaining pin causes the striker to hit the fuse.
NOTE: These devices are not recommended where silence is required
because a report is heard when the primer is fired.
The attachment and operation of the M2 Fuse Lighter are as follows:
(A) Slide the pronged fuse retainer over the end of the fuse and firmly seat
it.
(B) Waterproof the joint between the fuse and the lighter, if necessary, by
applying a seal compound (putty or mastic).
(C) In firing, hold the barrel in one hand and pull on the release pin with
the other hand.
(3) M60 FUSE LIGHTER
The attachment and operation of the M60 Fuse Lighter are as follows:
(A) Unscrew the fuse holder cap two or three turns
(B) Press the shipping plug into the lighter to release the split grommet,
and rotate the plug as it is removed.
(C) Insert end of fuse in place of the plug until it rests against the
primer.
(D) Tighten the fuse holder cap sufficiently to hold the fuse tightly in
place and thus waterproof the joint.
(E) To fire, remove the safety pin, hold the barrel in one hand, and pull on
the pull ring with the other hand
(1) This item consists of string, twine, or shoelaces that have been treated
with either a mixture of Potassium Nitrate and Granulated sugar or
Potassium Chlorate and Granulated sugar.
(2) Improvised string fuse does not directly ignite any incendiaries listed
in File 4 but is a primary initiator for all igniters listed in File 3
except:
Potassium Permanganate-Glycerin Powdered Aluminum-Sulfur Pellets
White Phosphorus and Subignitors for Thermite
-Materials and Equiptment
String, twine, shoelaces made of cotton or linen
Potassium Nitrate or Potassium Chlorate
Granulated Sugar
Small Cooking Pot
Spoon
Stove or hot plate
Soap
-Preparation
(1) Wash string or shoelaces in hot soapy water; rinse in fresh water.
(2) Dissolve one part potassium nitrate or potassium chlorate and one part
granulated sugar in two parts hot water.
(3) Soak string or shoelaces in the hot solution for at least five minutes.
(4) Remove the string from the hot solution and twist or braid three strands
of string together.
(5) Hang fuse up to dry.
(6) Check actual burning rate of the fuse by measuring the time it takes for
a known length to burn.
-Application
(1) This fuse does not have a waterproof coating and it must be tested by
burning a measure of length before actual use.
(2) Cut the fuse long enough to allow a reasonable time delay in initiation of
the incendiary system.
(3) Insert one end of the fuse in a quantity of an igniter mixture so that the
fuse end terminates near the center of the mixture. Be sure the fuse cord
is anchored in the igniter mixture and cannot pull away. In case of a
solid igniter material such as Fire Fudge, the improvised string fuse is
securely wrapped around a piece of solid igniter material.
(4) The fuse is initiated by lighting the free end of the fuse with a match.
(5) This fuse does not burn when it is wet. Its use is not recommended where
there is the possibility of the fuse getting wet.
CONCENTRATED SULFURIC ACID (OIL OF VITRIOL):
-Description
(1) This material is a heavy, corrosive, oily, and colorless liquid. Storage
is recommended in a glass container with a glass lid or stopper. Com-
mercially available sulfuric acid is approximately 93% concentrate with a
specific gravity of 1.835. This is commonly refered to as Concentrated
sulfuric acid.
(2) Concentrated sulfuric acid chars wood, cotton, and vegetable fibers,
usually without causing fire. The addition of water to concentrated
sulfuric acid develops much heat which may be sufficient to cause a fire
or an explosion. This depends on the quantity of acid, quantity of water,
and rate of addition of water
CAUTION: Always add concentrated sulfuric acid to water. NEVER add water to
concentrated acid!
(3) Certain igniter materials can be reliably brought to flaming by the
addition of concentrated sulfuric acid. This is brought about by the
chemical reaction between the sulfuric acid and the igniter materials. The
following igniters are initiated by concentrated sulfuric acid:
Sugar-Chlorate Fire Fudge Sugar-Sodium Peroxide
Aluminum Powder Match Head Silver Nitrate-Magnesium Powder
(4) The most important use for concentrated sulfuric acid as an initiator is
in conjunction with delay machanisms. The acid is held away from the
igniter for a period of time by making use of the corrosive action of the
acid to work it's way through a barrier. If the delay mechanism is placed
in a cold environment, the concentrated sulfuric acid will remain fluid at
extremely low temperatures. The following delay mechanisms are recom-
mended for use with concentrated sulfuric acid:
Gelatin Capsule Rubber Diaphram Paper Diaphram
Tipping delay Streched Rubber Band
-Material and Equiptment
Concentrated Sulfuric Acid.
-Preparation
NONE-If only battery grade sulfuric acid is available (specific gravity 1.200),
it must be concentrated before use to a specific gravity of 1.835. This
is done by heating it in an enameled, heat resistant glass or porcelain
pot until dense, white fumes appear. Heat only in a well ventilated area.
When dense, white fumes start to appear, remove the heat and allow acid
to cool. Store the concentrated acid in a glass container.
-Application
(1) GENERAL
(A) Commercial sulfuric acid is available in 13 gallon carboys. Smaller
quantities of this acid are available in chemical lab reagent storage
containers. It is recommended that a small quantity of acid, about one
pint, be secured and stored on a glass container until it is used.
(2) USE WITH DELAY MECHANISMS
(A) Construction of a specific delay mechanism is described in File 5.
within the delay mechanism, there is a container filled with acid. The
acid corrodes this container, is absorbed by the container until it comes
in contact with the igniter mixture
(B) Carefully fill the container in the delay mechanism with concentrated
sulfuric acid. This can easily be accompliched with a small glass
funnel. A medicine dropper is used when the delay mechanism container
is small.
CAUTION: Concentrated sulfuric acid must be handled carefully because it is
very corrosive. If it is splashed on clothing, skin or eyes, the
affected area must be immediately flushed with water. This may not
always be practical. It is recommended that eye protection be worn
by the user when pouring concentrated sulfuric acid. Many types are
available for this purpose. Rubber gloves can be worn to protect the
hands. A small bottle of water can be carried to flush small areas
of skin or clothing which may be contaminated with the acid.
(3) MANUAL APPLICATION
(A) Manual application of concentrated sulfuric acid for direct initiation
of an igniter is not recommended when fuse cord is available. It is
possible to employ this acid for direct initiation by quickly adding
three or four drops of igniter material. This can be done with a
medicine dropper. Keep hands and clothing clear of the igniter;
ignition may take place almost instantly with addition of acid.
CAUTION: Do not allow materials such as wood, sugar, cotton, or woolen fibers
to fall into the boiling acid. A violent rection could occur with
splattering of acid.
(B) Since sulfuric acid has a unique freezing point relation to acid
concentration, the information shown below is useful when this acid is
used with delay mechanisms in low temperature surroundings. Be sure of
acid concentration by checking with a hydrometer.
(1) Water causes spontaneous combustion of certain igniter mixtures. This is
caused by a chemical reaction of the igniter materials in the presence of
water. The following igniters are initiated by water:
(2) The most important use for water as an initiator is in conjunction with
delay mechanisms. Since only a few igniter mixtures are initiated by water
and it cannot be used at a freezing temperatures, its uses are limited.
When tactics so dictate, water can be reliably used with the following
delay mechanisms:
Gelatin Capsule Overflow
Tipping Delay Blancing Stick
Streched Rubber Band
-Material and Equiptment
Water.
-Preparation
None.
-Application
(1) Use with delay mechanisms. Construction of specific delay mechanisms is
presented in File 5. Within the delay mechanism, there is a container
filled with water. The water dissolves the container or is spilled from
the container and comes in container or is spilled from the container
and comes in contact with igniter mixture, initiating the fire train.
(2) Manual Application. Fuse cord, when available, is recommended in prefer-
ences to water as an initiator. Water is used for direct ignition or a
specific igniter by adding drops as with a medicine dropper. Keep hands
and clothing clear of the igniter; ignition may take place almost instant-
aneously with addition of water.
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