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An Ottoman redoubt of the Dardanelles Fortified Area. The weapon is possibly a German-made 28 cm SK L/40 gun on a coast defense mount.
An Ottoman redoubt of the Dardanelles Fortified Area. The weapon is possibly a German-made 28 cm SK L/40 gun on a coast defense mount.
50-pounder Model 1811 Columbiad (7.25 inch or 184 mm bore) and center-pivot mounting designed by George Bomford as an experimental coastal defense gun
50-pounder Model 1811 Columbiad (7.25 inch or 184 mm bore) and center-pivot mounting designed by George Bomford as an experimental coastal defense gun. This gun was built in 1811 as a component of the Second System of US fortifications.
Japanese 11-inch howitzer firing; shell visible in flight
Japanese 11-inch howitzer firing; shell visible in flight
A model of site no. 4 Heliodor Laskowski's Artillery Battery No. 31 (XXXI)
A model of site no. 4 Heliodor Laskowski's Artillery Battery No. 31 (XXXI)
The outer works of Fort McHenry in Baltimore harbor, although built in the 1860s, are broadly similar to early First and Second System forts built bef
The outer works of Fort McHenry in Baltimore harbor, although built in the 1860s, are broadly similar to early First and Second System forts built before the War of 1812, with low earthworks, although mounting much larger cannon and reinforced with masonry. The cannon are 8-inch converted rifles (lined down from 10-inch Rodman guns) and a 15-inch Rodman gun, typical of the post-Civil War era.
The Statue of Liberty is built on top of Fort Wood of the Second System
The Statue of Liberty is built on top of Fort Wood of the Second System
Fort Point – San Francisco – example of a mid-1800s Third System fort
Fort Point – San Francisco – example of a mid-1800s Third System fort