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NEW EXPLOSIVE
A recent Explosives In Coal Mines
Order isssued by the British Board of
Trade adds Ponrhyn powder to the per*
mitted list. The order states that the
powder contains not loss than 8.5 per eount.
and not moOre than 10.5 per cent. of nitro.
glycerlne. Other constituents and thcir
maxlmum percontages are nitrate of nam-n
monlum 01. chloride of qulum 22.5, and
wood meal 10e per cent. Four ounces of
Plenrhyn powder under test gave a uwlng
of 2.(0 in to the ballastlo pendulum, cont
pared with a pwing of 3.217 inches givan
by four ounces of geliglnite, contalning 00
per cent. of nitro-glycorine. The greatest
weight of the eoplosaivo to be used in any
one shot is specifed at 26 ouncas.
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