1 parts, ammonium
nitrate 93 parts, and moisture 1 part. This explosive must be used only
when contained in a case of an alloy of lead, tin, zinc, and antimony
thoroughly waterproof; it must be used only with a detonator or electric
detonator of not less strength than that known as No. 6.

~Nitro-Naphthalene.~--Nitro-naphthalene is formed by the action of nitric
acid on naphthalene (C_{10}H_{8}). Its formula is C_{10}H_{7}NO_{2}, and
it forms yellow needles, melting at 61 deg. C.; and of di-nitro-naphthalene
(C_{10}H_{6}(NO_{2})_{2}), melting point 216 deg. C. There are also tri-nitro
and tetra-nitro and [alpha] and [beta] derivatives of nitro-naphthalene.
It is the di-nitro-naphthalene that is chiefly used in explosives. It is
contained in roburite, securite, romit, Volney's powder, &c. Fehven has
patented an explosive consisting of 10 parts of nitro-naphthalene mixed
with the crude ingredients of gunpowder as follows:--Nitro-naphthalene, 10
parts; saltpetre, 75 parts; charcoal, 12.5 parts; and sulphur, 12.5 parts.
He states that he obtains a mono-nitro-naphthalene, containing a small
proportion of di-nitro-naphthalene, by digesting 1 part of naphthalene,
with or without heat, in 4 parts of nitric acid (specific gravity 1.40)
for five days.

Quite lately a patent has been taken out for a mixture of nitro-
naphthalene or di-nitro-benzene with ammonium nitrate, and consists in
using a solvent for one or other or both of the ingredients, effected in a
wet state, and then evaporating off the solvent, care being taken not to
melt the hydrocarbon. In this way a more intimate mixture is ensured
between the particles of the components, and the explosive thus prepared
can be fired by a small detonator, viz., by 0.54 grms. of fulminate.
Favier's explosive also contains mono-nitro-naphthalene (8.5 parts),
together with 91.5 parts of nitrate of ammonia. This explosive is made in
England by the Miners' Safety Explosive Co. A variety of roburite contains
chloro-nitro-naphthalene. Romit consists of 100 parts ammonium nitrate and
7 parts potassium chlorate mixed with a solution of 1 part nitro-
naphthalene and 2 parts rectified paraffin oil.

~Ammonite.~--This explosive was originally made at Vilvorde in Belgium,
under the title of the Favier Explosive, consisting of a compressed hollow
cylinder composed of 91.5 per cent. of nitrate of ammonia, and 8.5 per
cent. of mono-nitro-naphthalene filled inside with loose powder of the
same c