Charge 0.9805 grammes.
Mercury Chlorate
fulminate. of potash.
Specification 91.31 8.69
_6.--Ballistic-Pendulum Tests._
This record includes powder used, weight of charge, swing of mortar, and
unit disruptive charge, the latter being the charge required to produce
a swing of the mortar equal to that produced by ½ lb. (227 grammes) of
40% dynamite, or 3.01 in.
_7.--Record of Tests._
Tests Nos. 1 to 5 in Gallery No. 1, as set forth in preceding circular.
_8.--Trauzl Lead-Block Test._
Powder and test numbers, expansion of bore-hole in cubic centimeters,
and average expansion compared with that produced by a like quantity (10
grammes) of 40% dynamite, the latter giving an average expansion of 294
cu. cm.
_9.--Pressure Gauge._
Powder and test number, weight of charge, charging density, height of
curve, pressure developed, and pressure developed after cooling,
compared with pressure developed after elimination of surface influences
by a like quantity (100 grammes) of 40% dynamite, the average being
8,439 kg. per sq. cm.
_10.--Rate of Detonation._
Powder and test number, size of cartridge, and rate of detonation in
meters per second, for comparison with rate of detonation of 40%
dynamite, which, under the same conditions, averages 4,690 m. per sec.
_11.--Impact Machine._
Explosive and test numbers, distance of fall (2,000-gramme weight)
necessary to cause explosion, for comparison with length of fall, 11
cm., necessary to cause explosion of 40% dynamite.
_12.--Distance of Explosive Wave Transmitted by 1.25 by 8-in.
Cartridge._
Explosive and test numbers, weight of cartridge, distance separating
cartridges in tests, resulting explosion or non-explosion, for
comparison with two cartridges of 40% dynamite, hung, under identical
conditions, 13 in. apart, end to end, in which case detonation of the
first cartridge will explode the second.
_13.--Flame Test._
Explosive and test numbers, charge 100 grammes with 1 lb. of clay
stemming, average length of flame and average duration of flame, for
comparison with photographs produced by 40% dynamite under like
conditions.
[Illustration: PLATE X.
Fig. 1.--Separator for Grading Black Powder.
Fig. 2.--Safety Lamp Testing Gallery.