File:RBL12pdr8cwtBarrel&BreechDiagram.jpg

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Summary

Diagram of barrel and breech of British <a href="https://en.wikipedia.org/wiki/RBL_12_pounder_8_cwt_Armstrong_gun" class="extiw" title="en:RBL 12 pounder 8 cwt Armstrong gun">RBL 12 pounder 8 cwt field gun</a>.

This shows the "New Model" with the short 72-inch barrel.

A : Barrel inner tube : originally of wrought-iron; made of steel in later 72-inch barrels.
B, C, D : wrough-iron coils
E : Tappet-ring
L : Lever-ring
P : Breech-piece : forging of wrought-iron
S : Breech-screw
T : Trunnion ring
V : Vent-piece incorporating a right-angled vent.
a : Powder chamber
b : Shot chamber
c : Grip : narrowing of bore to force lead coating on projectile to engage with rifling grooves

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	06:21, 9 January 2017		1,000 × 312 (85 KB)	127.0.0.1 (talk)	Diagram of barrel and breech of British <a href="https://en.wikipedia.org/wiki/RBL_12_pounder_8_cwt_Armstrong_gun" class="extiw" title="en:RBL 12 pounder 8 cwt Armstrong gun">RBL 12 pounder 8 cwt field gun</a>.<br><p>This shows the "New Model" with the short 72-inch barrel. </p> <ul> <li>A : Barrel inner tube : originally of wrought-iron; made of steel in later 72-inch barrels.</li> <li>B, C, D : wrough-iron coils</li> <li>E : Tappet-ring</li> <li>L : Lever-ring</li> <li>P : Breech-piece : forging of wrought-iron</li> <li>S : Breech-screw</li> <li>T : Trunnion ring </li> <li>V : Vent-piece incorporating a right-angled vent.</li> <li>a : Powder chamber</li> <li>b : Shot chamber</li> <li>c : Grip : narrowing of bore to force lead coating on projectile to engage with rifling grooves</li> </ul>

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