R. Meyer J. Köhler A. Homburg Explosives

Crawford Bomb
Coyote blasting has now been almost completely displaced by
W Large Hole Blasting, because the spaces accommodating the explosive
can be produced more rationally in this way.
Crawford Bomb
A bomb used to determine the W Burning Rate of solid rocket propellants.
The propellant grains are in the form of thin rods (“strands”) which may
have been cut or extruded and protected against surface burning by
mantle insulation. The strand is placed in a bomb and electrically
initiated at one end, after which its combustion rate is recorded with
the aid of wire probes. Using compressed nitrogen, the pressure at
which the combustion take place is adjusted in the bomb; standard
values are 20, 40, 70, 100, 130, 180, 250 bar at a temperature
between – 40 °C and 60 °C.
Crimping
Anwürgen; sertir
The act of securing a blasting cap to a section of safety fuse by
compressing the metal shell of the cap against the fuse by means of a
cap crimper.
Critical Diameter
Kritischer Durchmesser; diamètre critique
The critical diameter is the minimum diameter of an explosive charge
at which detonation can still take place. It is strongly texture-dependent,
and is larger in cast than in pressed charges. Finely dispersed gas
inclusions considerably reduce the critical diameter.
In the case of very insensitive materials – ammonium nitrate, for
example – the critical diameter may be very large.
Cumulative Priming
Kumulative Zündung
Counter-current priming, in which the explosive charge is simultaneously
primed at two or more places, so that the detonation waves
travel to meet one another, and their effect becomes additive.
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