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The development of tanks in World War I was a response to the stalemate that trench warfare had created on the Western Front. Although vehicles that incorporated the basic principles of the tank (armour, firepower, and all-terrain mobility) had been projected in the decade or so before the War, it was the heavy casualties sustained in the first few months of hostilities that stimulated development. Research took place in both Great Britain and France, with Germany only belatedly following the Allies' lead. In Great Britain, an initial vehicle, nicknamed Little Willie, was constructed at William Foster & Co., during August and September 1915.〔http://www.bbc.co.uk/news/uk-england-25109879〕 The prototype of a new design that would become the Mark I tank was demonstrated to the British Army on February 2, 1916. Although initially termed "landships" by the Landships Committee, production vehicles were named "tanks", to preserve secrecy. The term was chosen when it became known that the factory workers at William Foster referred to the first prototype as "the tank" because of its resemblance to a steel water tank. The French fielded their first tanks in April 1917 and went on to produce more tanks than all the other combatants combined. The Germans, on the other hand, began development only in response to the appearance of Allied tanks on the battlefield. Whilst the Allies manufactured several thousand tanks during the War, Germany deployed only 20 of her own.〔Showalter, D.E. "More Than Nuts And Bolts: Technology And The German Army, 1870–1945." ''Historian'' 65.1 (Fall 2002): 123-143. ''Academic Search Premier''. Web. 16 Feb. 2012.〕 The first tanks were mechanically unreliable. There were problems that caused considerable attrition rates during combat deployment and transit. The heavily shelled terrain was impassable to conventional vehicles, and only highly mobile tanks such as the Mark and FTs performed reasonably well. The Mark I's rhomboid shape, caterpillar tracks, and 26 feet length meant that it could navigate obstacles, especially wide trenches, that wheeled vehicles could not. Along with the tank, the first self-propelled gun (the British Gun Carrier Mk I) and the first armoured personnel carrier (the British Mk IX) were also constructed in World War I. ==Conceptual roots of the tank== The conceptual roots of the tank go back to ancient times, with siege engines which were able to provide protection for troops moving up against stone walls or other fortifications. With the coming of the Industrial Revolution and the demonstrable power of steam, James Cowan presented a proposal for a Steam Powered Land Ram in 1855, towards the end of the Crimean War. Looking like a helmet on 'footed' Boydell wheels, early forerunners of the Pedrail wheel, it was essentially an armoured steam tractor equipped with cannon and rotating scythes sprouting from the sides. Lord Palmerston is said to have dismissed it as 'barbaric'. From 1904 to 1909, David Roberts, the engineer and managing director of Hornsby & Sons of Grantham, built a series of tractors using his patented 'chain-track' which were put through their paces by the British Army, a (small) section of which wanted to evaluate artillery tractors. At one point in 1908, Major William E. Donohue of the Mechanical Transport Committee remarked to Roberts that he should design a new machine with armour, capable of carrying its own gun. But, disheartened by years of ultimately fruitless tinkering for the Army, Roberts did not take up the idea. In later years he expressed regret at not having pursued it.〔The Devil's Chariots: The Birth and Secret Battles of the First Tanks. John Glanfield (Sutton Publishing, 2001) p16〕 An engineer in the Austro-Hungarian Army, Lieutenant Gunther Burstyn, inspired by Holt tractors, designed a tracked armoured vehicle in 1911 carrying a light gun in a rotating turret; equipped also with hinged 'arms', two in front and two at the rear, carrying wheels on the ends to assist with obstacles and trenches, it was a very forward-looking design, if rather small. The Austrian government said it would be interested in evaluating it if Burstyn could secure commercial backing to produce a prototype. Lacking the requisite contacts, he let it drop. An approach to the German government was similarly fruitless. In 1912, A South Australian, Lancelot De Mole, submitted a proposal to the British War Office for a "chain-rail vehicle which could be easily steered and carry heavy loads over rough ground and trenches". De Mole made several more proposals to the War Office after 1912, in 1914 and 1916, with a culminating proposal in late 1917, accompanied by a huge one-eighth scale model, yet all fell on substantially deaf ears. De Mole's proposal already had the climbing face, so typical of the later World War I British tanks, but it is unknown whether there was some connection. Inquiries from the government of Australia, after the war, yielded polite responses that Mr. De Mole's ideas had unfortunately been too advanced for the time to be properly recognised at their just value. The Commission on Awards to Inventors in 1919, which adjudicated all the competing claims to the development of the tank, recognised the brilliance of De Mole's design, even considering that it was superior to the machines actually developed, but due to its narrow remit, could only make a payment of £987 to De Mole to cover his expenses. De Mole noted in 1919 that he was urged by friends before the war to approach the Germans with his design, but declined to do so for patriotic reasons. Before World War I, motorized vehicles were still relatively uncommon, and their use on the battlefield was initially limited, especially of heavier vehicles. Armoured cars soon became more commonplace with most belligerents, especially in more open terrain. On August 23, 1914, the French Colonel Jean Baptiste Eugène Estienne, later a major proponent of tanks, declared: ''Messieurs, la victoire appartiendra dans cette guerre à celui des deux belligérants qui parviendra le premier à placer un canon de 75 sur une voiture capable de se mouvoir en tout terrain'' ("Gentlemen, the victory will belong, in this war, to the one of the two belligerents who will be the first to succeed in mounting a 75 mm gun on a vehicle capable of moving in all types of terrain"). Armored cars did indeed prove useful in open land such as in deserts, but were not very good at crossing obstacles (e.g. trenches, barriers) or in more challenging terrain. The other issue was that it was very hard to add much protection or armament. The main limitation was the wheels, which gave a high ground pressure for the vehicle's weight. This could be solved by adding more wheels, but unless they also were driven, the effect was to reduce traction on the powered wheels. Driving extra wheels meant more drive train weight, in turn requiring a larger and heavier engine to maintain performance. Even worse, none of this extra weight was put into an improvement of armor or armament carried, and the vehicles were still incapable of crossing very rough terrain. The adoption of caterpillar tracks offered a new solution to the problem. The tracks spread the weight of the vehicles over a much greater area, which was all used for traction to move the vehicle. The limitation on armor and firepower was no longer ground pressure but the power and weight of the power-plant. The remaining issue was how to utilise and configure a vehicle. Major Ernest Dunlop Swinton RE, was the official British war correspondent serving in France in 1914. He recounts in his book ''Eyewitness'' how the idea of using caterpillar tracks to drive an armoured fighting vehicle came to him on October 19, 1914, while he was driving through northern France. In July 1914 he had received a letter from a friend, Hugh Marriott, a mining engineer, drawing his attention to a Holt caterpillar tractor that Marriott had seen in Belgium. Marriott thought it might be useful for transport over difficult ground, and Swinton had passed the information on to the appropriate departments. Now Swinton suggested the idea of an armoured tracked vehicle to the military authorities, by sending a proposal to Lieutenant-Colonel Maurice Hankey. Hankey in turn tried to interest Lord Kitchener in the idea; when this failed he sent a memorandum in December to the Committee of Imperial Defence, of which he was himself the secretary; Winston Churchill the First Lord of the Admiralty was one of the members of the committee. Hankey proposed to build a gigantic steel roller, pushed by tracked tractors, to shield the advancing infantry. Churchill in turn wrote a note on January 5 to the Prime Minister H. H. Asquith, in which he warned that the Germans might any moment introduce a comparable system. A worried Asquith now ordered Kitchener to form a committee, headed by General Scott-Moncrieff, to study the feasibility of Swinton's idea; however, after trials with a Holt 75 h.p. machine the committee concluded in February 1915 that the idea was impractical. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Tanks in World War I」の詳細全文を読む スポンサード リンク
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