.
Mass for breech-sight.

The BORE includes all the part bored out, viz.:

Cylinder of bore.
Chamber.

These guns must not be polished bright.

BOAT-CARRIAGE COMPLETE, consists of--

Bed.
Slide.
Compressor-plate.
Compressor-bolts.
Compressor-handles.
Lugs for loop.

FIELD-CARRIAGE COMPLETE, consists of--

Axle.
Trail.
Braces.
Supports for transporting boxes.
Lugs for loop.
Trail-wheel or runner.
Bolt for trail-wheel or runner.
Socket for handspike.
Elevator.
Disk of elevator.
Box for elevator.

[Illustration: HOWITZER AND BOAT CARRIAGE. D. Van Nostrand Publisher.
Julius Bien, pr.]

[Illustration: HOWITZER ON FIELD CARRIAGE. D. Van Nostrand Publisher.
Julius Bien, pr.]

EXERCISE OF THE BOAT-HOWITZER.

20. While preparations are in progress for clearing out the boats, the
Officer of each boat will see that the howitzer, and its various
equipments, are also in readiness. The Junior Officer or Officer of
the piece will attend to the gun itself and its carriages.

The Quarter Gunner will get up the ammunition from below; also the
lock, sights, sponges, spare fuzes, ammunition-pouches, and primers.
Spare article box.

This will be the proper time for examining the shrapnel and shells,
which must receive the particular attention of the Officer who is to
command the boat.

The Captain of the gun will look after the traverses, tracks, and
pivot-plates.

The Coxswain will have ready the thwarts, oars, masts and sails.

When the boat has been cleared for hoisting out, lay the thwarts and
traverses, and bolt the pivot-plates on the bows and quarters; if the
stem and stern pivot-plates interfere with the purchases, they can be
secured after the boat is in the water. If the field-carriage is to
accompany the gun, lay the wheel and trail tracks.

In a sea-way, it may be better to place the howitzer in the launch,
laying it athwartships, and bolting the two ends of the slide into the
bow pivot-plates, which will hold it perfectly firm.

As a general rule, the howitzer is not to be handled separately from
one of its carriages. It may be hoisted into the launch on either
field or boat carriage, as circumstances may dictate.

When the boat-carriage is preferred, sling it with a stout strap
passed through the loop-lugs and brought up round the gun, into which
hook the purchase; previously shove the bed a little towards the rear
end of the slide, so that