MPA Logo, San Francisco Maritime National Park Association, USS Pampanito, Historic Ships at Hyde Street Pier, Education Programs Maritime Park Association Home Page Maritime Park Association Home Page Events Maritime Park Association Home Page Maritime Park Association Home Page Maritime Park Association Home Page Volunteer Membership Donate Maritime Park Association Home Page USS Pampanito Submarine Historic Ships at Hyde Street Pier Education Programs About Maritime Park Association Home Page Directions to Maritime Jobs at Maritime Facility Rental at Maritime Trustees of the Association Calendar Press Room Store Maritime Map
E. FIRING THE ROUND
Figure 38

The breech is completely closed and the round is fired. Firing occurs after the breech is closed, by the action of the cam of the right inner crank upon the sear. The cam forces the sear inward, releasing the inner cocking lever and the firing pin. The firing pin strikes the primer, which explodes the propellant charge of the round.

F. EJECTING THE CASE
Figure 39

The barrel assembly, breech mechanism, and tray are moving rearward as a result of the momentum imparted by the powder pressure at the beginning of recoil. The breech block is in the open position, the outer and inner cranks having been rotated by action of the roller, riding against the cam surface of the side door. The firing pin is cocked by action of the cam of the left inner crank depressing the outer cocking lever. As the breech block descended, it struck the toes of the extractors, ejecting the empty case. The feed pawls, due to the action of the tray guides, are rising in order to feed the next round onto the tray.

A complete cycle has now taken place, and the action repeats itself in automatic fire as long as the loader is supplied with ammunition and the trigger mechanism is held in the firing position.

FIRING THE ROUND
Figure 38

EJECTING THE CASE
Figure 39

 

Copyright © 2013, Maritime Park Association.
All Rights Reserved.
Legal Notices and Privacy Policy
Version 3.00