US Primer, Electric, M30
This primer is initiated by heat resulting from the resistance offered by a platinum ignition wire to an electric current. A current of 1.1 amperes is required to fire the primer. It is usually supplied by a special hand operated magneto which is considered safest for the work. The primer explosive train consists of guncotton wrapped around the platinum ignition wire; 3 grains of loose black powder over the guncotton and extending into a hollow black powder pellet weighing 13.39 grains; and a solid pellet of black powder weighing 22.80 grains. The primer is sealed at the forward end with shellac and a chipboard closing cup.
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