Search results
Results from the WOW.Com Content Network
In most US cities, a city block is between 1 ⁄ 16 and 1 ⁄ 8 mi (100 and 200 m). In Manhattan, the measurement "block" usually refers to a north–south block, which is 1 ⁄ 20 mi (80 m). Sometimes people living in places (like Manhattan) with a regularly spaced street grid will speak of long blocks and short blocks.
During World War I and World War II, many types of blockhouses were built, when time allowed usually constructed of reinforced concrete. The major difference between a modern blockhouse and a bunker is that a bunker is constructed mostly below ground level while a blockhouse is constructed mostly above ground level. [14]
Nigeria participated in World War II as a British colony in September 1939, following the government's acceptance of the United Kingdom's declaration of war on Nazi Germany [1] and entering the war on the side of the Allies. It was a key country in the African theatre, a critical part of the Allied strategy in Africa.
A nuclear bunker buster, [1] also known as an earth-penetrating weapon (EPW), is the nuclear equivalent of the conventional bunker buster. The non-nuclear component of the weapon is designed to penetrate soil , rock , or concrete to deliver a nuclear warhead to an underground target.
During World War I, Sir Ernest William Moir produced a design for concrete machine-gun pillboxes [5] constructed from a system of interlocking precast concrete blocks, with a steel roof. Around 1,500 Moir pillboxes were eventually produced (with blocks cast at Richborough in Kent) and sent to the Western Front in 1918.
Ogbunigwe, also called Ojukwu Bucket, was a series of weapons systems including command detonation mines, improvised explosive devices, and rocket-propelled missiles, mass-produced by the Republic of Biafra and used against Nigeria between 1967 and 1970 in the Nigerian Civil War. [2] [3] [4] [self-published source] [5]
Igbo war canoe from Nigeria, circa 1830s, demonstrates a blend of indigenous and imported technology. Construction is of a single log. Steering is provided by two oars-men in bow and stern. Muskets stand ready on the fighting platform in the center, and captured enemy flags and trophies fly overhead.
Manual labour was the sole means of construction, precluding the use of modern earth-moving equipment or technology. Earth excavated to create the inner moat was repurposed to build the external ramparts (outer walls). These walls varied in size, from shallow traces to towering structures reaching up to 20 metres (66 ft) in height.