The carriages of Gun Sloops and other vessels carrying XI-in. guns allow of an elevation of 20°.
[ [35] When the vessels are moving, it is best to train the gun a little ahead, watching when the object draws in line; then, as the roll brings the piece right in elevation, it is fired.
[ [36] Many officers are of the opinion that this order should be divided—"Load with Cartridge," and "Load with Shell." But those guns would be very badly served which should wait until this time to give the order for the species of projectile or class of fuze required. After "Load," is the proper time to give subsidiary order to Shellmen what projectile and length of fuze to bring for next fire.
[ [37] "In 10,000 fires, when testing guns of different calibres, with the regulation locks, less than fifty primers failed from all causes."
CHAPTER V.
RIFLED CANNON.
384. The rifled cannon at present in service are—
Parrott.
| Denomination. | Weight. | Charge. | Weight of Shell. | Weight of Shot. |
| lbs. | ||||
| 6.4-inch, or 100-pounder | 9,700 | 8 lbs. rifle. | 80 lbs. | 70 lbs. |
| 5.3-inch, or 60-pounder | 5,400 | 6 lbs. rifle. | 50 lbs. | 60 lbs. |
| 4.2-inch, or 30-pounder | 3,550 | 3¼ lbs. cannon. | 29 lbs. | 30 lbs. |
| 3.67-inch, or 20-pounder | 1,750 | 2 lbs. cannon. | 18 lbs. | 20 lbs. |