Explosives . r should be less than that of its working end : and the tube should be slightly conical after the first short distance. On no account should any attempt be made to work the explosive when it is frozen, and work should be suspended altogether if the temperature inside the hut is below 50°. Only a small quantity of explosive should be allowed in the hut at one time, the remainder being kept in a cupboard outside. The huts should beat least 40 yards one from another, and surrounded with good mounds. The material thus made is a plastic mass varying in colour from buff to Properties re
Explosives . r should be less than that of its working end : and the tube should be slightly conical after the first short distance. On no account should any attempt be made to work the explosive when it is frozen, and work should be suspended altogether if the temperature inside the hut is below 50°. Only a small quantity of explosive should be allowed in the hut at one time, the remainder being kept in a cupboard outside. The huts should beat least 40 yards one from another, and surrounded with good mounds. The material thus made is a plastic mass varying in colour from buff to Properties reddish brown. Direct contact with water causes the nitro-glycerine toDynamite separate from it ; therefore great care must be exercised when u>ing it in wet places. It freezes BOmewhat more readily than liquid nitro-glycerine. When ignited in small quantities it simply hums away fiercely, but fatal accidents have arisen in considerable number from persons supposing that, 1 See 61, NTos. and Fig 72. Dynamite CartridgeMachine. EXPLOSIVES as it i- reasonably safe to ignite a few carta unfrozen dynamite, it i- equally Bafe to warm it upon a shovel, in an oven, in a tin over a fore, or invarious other ways, which usually lead to a verdict of Accidental dynamite i> much more susceptible to explosion by simple it is less sensitive to detonation, as also to a blow or friction under -conditions, but the annals of explosives are full of instances of the fatalunexpected explosion of frozen nitro-glycerine explosives, which had notbeen treated with proper respect. Tlu- density of dynamite i< stated to be1-4 to 1 .V but I have found it to be about 1»;2. If there were no air B]in it the density would be 177. The temperature of ignition i- given a- 182°.The following are analyses made by Dupre in 1901 of two samples fromArd< •• Nitro-glycerine ..... -elguhr ...... Ammonium carl ? • ... Other soluble matter .... Moisture ...... 3 -
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