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The sign accompanying the 6-pounder saluting gun. It reads

6-Pounder Saluting Gun

The 6-pounder gun was standard armament on ships of the Spanish-American War era but it is long since obsolete as an offensive weapon. Two of these guns are now carried on board major combatant ships for firing gun salutes with blank charges. The interval between firings is normally 5 seconds. The number of guns in a salute varies from 5 to 21, depending on the occasion.