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DESCRIPTION. The
igniter consists of a hollow, cylindrical, glass body into which fits a
solid pressure head. The body is screw-threaded externally to take (a)
the detonator pocket, and (b) to screw into
the igniter seating contained in the body of the mine. The detonator
pocket is made of plastic. Inside the igniter body are two glass ampoules
con-taining liquid. These are fixed by adhesive to a circular celluloid
disk. A collar formed round the pressure head seats on the upper rim of
the igniter body, the lower face of the head being hedl just clear of the
glass ampoules. A circumferential shear groove is for-med round the
pressure head. |
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OPERATION. A
pressure of 150 kg on the pressure plate of the Topf mine will cause it to
shear and bear against the pressure head of the Topf igniter. This
pressure head will, in turn, be forced into the glass ampoules which will
be crushed. The interaction of the liquids will ignite the detonator, thus
igniting the primer and finally the main charge of the mine. (See fig.
273.) |
