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Illustration of an aerial view of an 11th century Norman castle in Europe. From this view, it is possible to see the outer wall, moat, outer and inner courts, the keep, turrets, stables and other interior buildings. There is a palisade of stakes around the moat.

An 11th Century Norman Castle, Aerial View

Illustration of an aerial view of an 11th century Norman castle in Europe. From this view, it is possible…

"Plan of Amiens Cathedral. A, Apsidal aisle. B B, Outer aisles of choir. F G, Transepts. H, Central tower. I J, Western turrets. M, Principal or western doorway. N N, Western side doors. P Q, North and south aisles of choir. R R R, Chapels. T U, North and south aisles of nave." — Winston's Encyclopedia, 1919

Amiens Cathedral

"Plan of Amiens Cathedral. A, Apsidal aisle. B B, Outer aisles of choir. F G, Transepts. H, Central…

"Hearson's machine is cylindrical in form, and is surmounted by two turrets. Internally the cylinder is divided into two compartments by a transverse portion, one being occupied by a rotary blower, an apparatus similar in construction to the drum of a water-meter, and the other by an elevator or dipper wheel, the function of which is to raise gasolin into the blower chamber, where the gasoline must be maintained at a constant level." — Encyclopedia Britannica, 1893

Auto-Pneumatic Apparatus

"Hearson's machine is cylindrical in form, and is surmounted by two turrets. Internally the cylinder…

USS <em>Monitor</em> was the first ironclad warship commissioned by the United States Navy. <em>Monitor</em> consisted of a heavy round revolving iron gun turret on the deck, housing two 11 inch Dahlgren guns, paired side by side.

Interior of the Monitor's Turret

USS Monitor was the first ironclad warship commissioned by the United States Navy. Monitor…

"1, Turret, St. Peter's Church, Oxford; 2, Turret, Rochester Cathedral; 3, St. Mary's Church, Cheltenham; 4, Bayeux Church, Normandy." &mdash; Chambers, 1881

Spire

"1, Turret, St. Peter's Church, Oxford; 2, Turret, Rochester Cathedral; 3, St. Mary's Church, Cheltenham;…