Besides, each of these numbers--7, 8, 9, and 10--is to be increased by
two or three Runner-boys, for the purposes above described.

186. In vessels of and above the class of frigates, or having two
magazines--one forward and the other aft--the forward half of the guns
on each deck is to be supplied from the forward magazine, and the
after half from the after magazine. Thus, for each deck of guns, one
scuttle at each of the two magazines, together with its corresponding
chain of scuttles, will be sufficient, if all the guns be of the same
calibre and class, or have like charges. But the introduction on board
of any vessel of guns differing in either of these respects will
involve the necessity above stated of a separate scuttle of delivery
at the magazine, and also of a distinct chain of scuttles connected
with it, for the exclusive supply of each variety of charges that may
be introduced.

In this case, the exceptional guns should be supplied, whenever
practicable, from the larger magazine, when there are two differing in
size.

187. In single-deck vessels carrying more than sixteen guns, all of
the same calibre and class, and having but one magazine, two scuttles
at that magazine will be sufficient--one to supply the forward half of
guns, and the other the after half.

188. In single-deck vessels carrying only sixteen guns, or less, all
of the same calibre and class, or having like charges, one scuttle at
the magazine will suffice.

189. Should any single-deck vessel be of such great length, or so
remarkable in her armament of guns, although all of the same calibre
and class, as to render additional scuttles advisable, they are to be
cut.

PASSING-SCUTTLES.

190. All the powder is to be passed up from the orlop or berth deck
through circular scuttles, cut in the deck or decks at places, as
nearly as circumstances will permit, immediately abreast of the middle
of the particular set of guns to the supply of which each chain of
scuttles is specially appropriated. Besides these scuttles for passing
the powder up, there are to be corresponding ones for each set,
provided with a canvas chute for returning the empty boxes below. The
drawing shows the manner of supplying an upper deck and returning the
empty boxes from it. Each deck is to be supplied in like manner, by a
distinct and separate arrangement, through as many independent sets of
scuttles as may be required by the preceding "Arrangements for
deliveri