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Italian navy's Caio Duilio battleship launched in 1913. The ship was used during World War I and II.

Caio Duilio Battleship Italian Navy

Italian navy's Caio Duilio battleship launched in 1913. The ship was used during World War I and II.

"Four battle cruisers were launched in 1915, but they had not been completed up to 1921. On a displacement of 32,200 tons, with a length of 750 ft., 12 14 in. and 24 5 in. guns and 6 torpedo tubes were to have been carried, turbine engines of 66,000 H.P. being estimated to give a speed of 27 knots. The side armour had a maximum thickness of 12 inches." — Encyclopaedia Britannica, 1922

Russian Navy Battleship

"Four battle cruisers were launched in 1915, but they had not been completed up to 1921. On a displacement…

The illustration of the Kongo class battlecruiser by the Japanese Imperial Navy. The ship was designed by Sir George Thurston, and the first ship built in Britain by Vickers at Barrow—in&mdashFurness.

Japanese Imperial Navy Kongo Class Battlecruiser

The illustration of the Kongo class battlecruiser by the Japanese Imperial Navy. The ship was designed…

German Navy Battlecruiser, SMS Hindenburg. The ship was launched in 1915, and used during World War I.

Hindenburg German Navy Battleship

German Navy Battlecruiser, SMS Hindenburg. The ship was launched in 1915, and used during World War…

A U.S. Navy Omaha class battlecruiser launched in 1920. The top speed of the cruiser is 35 knots (40 mph). The ship was powered by steam.

United States Navy Omaha Class Battlecruiser

A U.S. Navy Omaha class battlecruiser launched in 1920. The top speed of the cruiser is 35 knots (40…

Japanese Imperial Navy Tatsuta battlecruiser launched in 1918. One of the first ships to be armed with triple torpedo tubes. Tatsuta's was designed to go at a top speed of 36 knots, or 41 mph.

Japanese Imperial Navy Tatsuta Battlecruiser

Japanese Imperial Navy Tatsuta battlecruiser launched in 1918. One of the first ships to be armed with…

The Flag of St. George is a flag of Great Britain. It shows the red cross of St. George on a white field, and survives only as a flag of command in the royal navy.

Flag of St. George

The Flag of St. George is a flag of Great Britain. It shows the red cross of St. George on a white field,…

The White Ensign is a flag of Great Britain. It is the peculiar flag of the royal navy.

White Ensign

The White Ensign is a flag of Great Britain. It is the peculiar flag of the royal navy.

The Blue Ensign is a flag of Great Britain. It is the distinctive ensign of the royal naval reserve.

Blue Ensign

The Blue Ensign is a flag of Great Britain. It is the distinctive ensign of the royal naval reserve.

The Union Flag is the national flag of Great Britain. It is more properly called the 'Great Union', established by royal proclamation of April 12, 1606. It was formed by a combination of the crosses of St. George and St. Andrew; at the union with Ireland in 1801, the cross of St. Patrick was added. It is essentially the military flag of England. It is flown as the war jack on the jackstaff of English warships.

Union (National) Flag of Great Britain

The Union Flag is the national flag of Great Britain. It is more properly called the 'Great Union',…

A United States Navy cruiser; Wampanoag.

Wampanoag

A United States Navy cruiser; Wampanoag.

US Navy ship: Atlanta.

Atlanta

US Navy ship: Atlanta.

Newark, a US Navy ship.

Newark

Newark, a US Navy ship.

Brooklyn, a US navy ship.

Brooklyn

Brooklyn, a US navy ship.

Columbia, a US navy cruiser.

Columbia

Columbia, a US navy cruiser.

"To measure the depth of; fathom; try or test, as the depth of water and the quality of the ground, by sinking a plummet or lead attached to a line on which is marked the number of fathoms...a, lead; b, counterpoised hooks which engage the loop at the top of the lead; d, wedge-shaped cup for specimens, attached by cord or wire to the pivot of the hooks; e, attachment for the sounding-line or wire. When the cup d touches bottom, the hooks b drop into the position show in E; the sinker or lead then drops over, releasing the cup, and this, with its specimen and the hooks, is drawn to the surface." —Whitney, 1889

British Navy Sounding Apparatus

"To measure the depth of; fathom; try or test, as the depth of water and the quality of the ground,…

"A trumpet-shaped instrument by which the sound of the human voice is reinforced so that it may be heard at a great distance or above other sounds, as in hailing ships at sea or giving orders at a fire. In the United States navy a speaking trumpet is the badge of the officer of the deck at sea... a, tube; b, bell; c, mouthpiece; d, rings for a band by which the trumpet may be attached to the person." —Whitney, 1889

Speaking Trumpet

"A trumpet-shaped instrument by which the sound of the human voice is reinforced so that it may be heard…