rain, as
it is what passes through the cannon-sieve, but remains on the
musket-sieve; and that the Navy Musket has the same size for the
larger grain, but contains more small grain than the Army.

In exchanging powder with the Army, it is necessary to attend to these
distinctions.

136. Powder-houses or magazines on shore are to be inspected by the
Ordnance Officers at least once in every week, and every precaution
taken to guard them against danger of explosion, and to preserve the
powder dry and in good condition.

137. Powder-barrels in magazines, where there are no racks, should be
placed on their sides, with their marked ends towards the alleys,
three tiers high, or four tiers, if necessary, with small skids on the
floor and between the several tiers of barrels, using chocks at
intervals on the lower skids to prevent the barrels from rolling. If
it can be avoided, fixed ammunition should not be put in the same
magazine with powder in barrels.

138. If it is necessary to pile the barrels more than four tiers high,
the upper tiers should be supported by a frame resting on the floor;
or the barrels may be placed on their heads, with boards between the
tiers.

There should be an unencumbered space of 6 or 8 feet square at the
doors of the magazine.

139. Whenever practicable, the barrels should be arranged in double
rows, with a passage-way between the rows, so that the marks on each
barrel may be seen at a glance, and any barrel easily reached.

140. Besides being recorded in the magazine-book, each lot of powder
should be inscribed on a ticket attached to the lot showing the
entries and the issues.

141. Magazines should be opened and aired in clear, dry weather, the
ventilators kept free, and no shrubbery or trees allowed to grow so
near as to shade the building from the sun.

142. The moisture of a magazine may be absorbed by chloride of lime,
or charcoal, suspended in an open box under the arch, and renewed from
time to time. The use of quicklime is dangerous, and forbidden.

143. When powder is handled in powder-houses on shore, either for the
purpose of inspection or preparation for delivery to ships, the
baize-cloth is to be spread, and the people, before entering the
magazine, must divest themselves of every metal implement, empty their
pockets, that nothing likely to produce fire may escape detection, and
put on the magazine dresses and slippers. The barrels must be opened
only on the floor-clot