San Francisco's harbor defenses relied on a complex system of guns, underwater mines, and antisubmarine nets. Central to the system were guns of many sizes, each with its own purpose. These guns were classified by the diameter of the projectiles they fired. ![]() San Francisco History Center, San Francisco Public Library
![]() PARC, Golden Gate National Recreation Area ![]() San Francisco History Center, San Francisco Public Library ![]() PARC, Golden Gate National Recreation Area ![]() San Francisco History Center, San Francisco Public Library |
Last updated: February 28, 2015