They are fired either from behind intrenchments like other mortars, or they may accompany troops in effecting lodgments in towns and fortified places.
23. What kind of projectiles are thrown from mortars?
Shells, fire-balls, carcasses, and stones.
24. How rapidly may siege mortars be fired?
At the rate of twelve rounds per hour continuously; and in case of need with greater rapidity.
35]
PART I. SECTION VI.
SEA-COAST ARTILLERY.
1. How are Sea-Coast pieces mounted?
On barbette, casemate, flank-casemate, and columbiad carriages; and the carriage upon which the mortar is mounted—called its bed. These carriages do not subserve the purpose of transportation; the barbette carriage may, however, be used for moving its piece for short distances, as from one front of the work to another.
2. What number and kind of pieces are required for the armaments of forts on the sea-board?