Q. What is the rotating-band and what is its use?
A. The copper band near the base end. It is forced into the grooves of the rifling and causes the projectile to take up a rotary motion to prevent tumbling during flight.
Q. Why are some projectiles capped?
A. Experimental tests have shown that it will penetrate armor-plate deeper than those not capped.
FRANKFORD ARSENAL TIME PERCUSSION OR COMBINATION FUSE. MODEL 1900.
| a | Body | |
| b' | Compressed powder-ring | |
| b | Retaining-ring | |
| b2 | Brass ring | } |
| b3 | Brass cup | } Gas-check |
| b4 | Felt washer | } |
| c | Time-train | |
| d | Time-train cone | |
| e | Cone-cover | |
| e' | Drawn-brass waterproof cover | |
| e2 | Soldering-strip | |
| f | Cap | |
| g | Clamping-nut | |
| h | Time-plunger | |
| h' | Split-ring spring | |
| i | Safety-pin | |
| j | Connecting-tube | |
| k | Powder-charge | |
| k' | Powder-chamber closing-screw | |
| l | Percussion-primer | |
| l' | Tin-foil discs | |
| l2 | Percussion-primer composition | |
| l3 | Brass cup | |
| m | Concussion firing-pin | |
| n | Percussion firing-pin sleeve | |
| n' | Percussion safety-wire | |
| o | Percussion firing-pin | |
| p | Dowel-pins (2) | |
| q | Stud-pin | |
| r | Concussion-primer composition | |
| r' | Tin-foil disc | |
| ss | Vents (4) | |
| t | Split-ring spring | |
| w | Wrench-hole | |
| y | Tin-foil base-cover | |
| z | Bottom closing-screw | |
| z' | Base-vents (8) | |
| z2 | Locking-groove |
Fig. 40.