Barbette
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Barbettes are several types of gun emplacement in terrestrial fortifications or on naval ships.
US Army 16-inch gun M1919 on barbette mount M1919; this was a high-angle mount with elevation to 65°.
Illustration of several armored ships from the 1880s, showing the degree of experimentation with armament arrangements
USS Maryland under construction in 1917, showing the forward two barbettes without the gun turrets installed
Rear "Cheyenne"-pattern gun position on a B-17G Flying Fortress
Pre-dreadnought battleship
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Pre-dreadnought battleships were sea-going battleships built from the mid- to late- 1880s to the early 1900s. Their designs were conceived before the appearance of HMS Dreadnought in 1906 and their classification as "pre-dreadnought" is retrospectively applied. In their day, they were simply known as "battleships" or else more rank-specific terms such as "first-class battleship" and so forth. The pre-dreadnought battleships were the pre-eminent warships of their time and replaced the ironclad battleships of the 1870s and 1880s.
HMS Royal Sovereign (1891) was the first pre-dreadnought battleship of the Royal Navy.
HMS Ocean was typical of pre-dreadnought battleships
HMS Dreadnought shows the low freeboard typical for early ironclad turret-ships. This ship, launched in 1875, should not be confused with her famous successor, launched in 1906, marking the end of the pre-dreadnought era.
HMS Ramillies was the fourth ship of the influential Royal Sovereign class. The diagonal tubes are spars for torpedo nets.