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Dart's Elevator was the world's first steam-powered grain elevator. It was designed and built by Joseph Dart and Robert Dunbar in 1842 in Buffalo, New York. The elevator burned in the 1860s. == Description == Designed and built in 1842 by Dart and Dunbar, the Dart Elevator in Buffalo, New York was 50 by 100 feet. It was the world's first steam-powered grain elevator. It had a leather vertical conveyor belt with buckets. This system could unload grain from the interiors of a lake boat hull, and do it far faster than the manual methods previously employed. The boat just had to be moored next to the storage elevator. Dunbar designed most of the grain elevators that at the end of the nineteenth century were along the Buffalo River. The city of Buffalo received grain from the states of Michigan and Illinois in volume in the 1830s. That presented the problem of congestion on the docks. The existing method of managing the transfer of grain from boats overwhelmed the port. Dart invented a mechanical system of belts with buckets attached to scoop up the grain from the hulls of boats and put into storage.〔 Dart also devised a means of lowering the bottom end of the bucket into the holds of the large vessels that brought grain across the Great Lakes or of the barges that moved it along the Erie Canal. This was a turning point in the industry, marking a shift from the manual labor of men on ladders to a mechanized system. An important feature in Dart’s invention was the use of a rigid, nearly vertical frame to hold the bucket, chain, and sprocket assembly. This vertical assembly is contained in a building and referred to as the "marine tower" leg. This vertical conveyor assembly is housed in a wooden sleeve and could be leaned outward at the bottom of the elevator structure. It then is lowered directly into the interior of a vessel that had grain in its hold. Dart's elevator utilized a set of grain bins. On top of them was a cupola that had equipment for weighing. Incoming grain was taken to the top by the grain elevator vertical assembly and discharged by gravity to storage after being weighed. Then sold grain to be transferred was taken from the storage bins. It was elevated again to the cupola, weighed out and dispensed to a barge, train or grain carriage vehicle. The" marine leg" of the elevator was most important to these procedures and functions. Dart's innovations permitted the grain to be brought up with a set of scoop buckets attached to an endless loop belt. The elevator system undone and positioned the elevator leg in different forms. One was the "stiff leg" within the building which brought up grain into the grain elevator storage facilities from land based transports. Another was the "loose leg" brought up grain from ships and barges into the grain elevator building. The "loose leg" was kept in a raised position within the grain elevator building when not in use. That required an unusual tower above the cupola roof. When a ship's cargo of grain was to be unloaded the "loose leg" was lowered into the belly interior of the ship's hull. Dart's gain elevator set into place industrial principles of grain storage management. By the end of the nineteenth century these elevator systems had promoted a new style in architecture. The application of these grain transfer systems affected how storage buildings were designed and built. These elevator conveyor systems permitted the transfer of grain to bins separated by a distance, where before they had to be close to each other. The equipment that was designed with this new technology was more efficient and cost effective in management of grain. The layout of conveying equipment had an effect on the architecture of the elevator building. The classic high cupola grain storage building became typical. Many of the elevator companies incorporated these new innovations of Dart. Dart with engineer Dunbar applied state-of-the-art technology to the administration of grain. They applied their grain elevator innovations to boats and rail transportation that updated the old school methods of moving grain by hand to fit the greater needs of modern times.〔 Dart's improved innovation of 1842 was an arrangement of buckets that were placed apart on a leather belt by a couple of feet. The bucket mechanism was taken out of the warehouse building and into the interior of a vessel holding grain. This mechanism was called a "marine leg." Dart further improved the system to where the buckets were put sixteen inches apart. The elevator bucket mechanism operated up to 2,000 bushels an hour. That amount was equivalent to a crew of men working all day in ideal conditions. Dart's grain elevator building was finished in late 1842 at a site where the Buffalo river and the Evans Ship Canal meet. His elevator was a successful enterprise from the start. The Bennett Elevator was later built at this property. Dart was often paid double his regular fee for emergency storage of grain from a farm. The first vessel unloaded at Dart's elevator was the schooner ''Philadelphia'' which had 4,515 bushels of wheat.〔 The first cargo of corn unloaded was on 22 June 1843 from the schooner ''South America.'' Dart's elevator unloaded during the first year of operation over 200,000 bushels of grain. This early mechanization displaced the backs of Irish workers, who on a good day could manually carry "not more than 2,000 bushels a day" from the ship's hold. The invention had a profound effect on Buffalo and the movement of grains on the Great Lakes. The technology had worldwide application: "The grain elevator developed as a mechanical solution to the problem of raising grain from the lake boats to bulk storage bins where it remained until being lowered for shipment on canal boats or railroad car. Less than fifteen years after Joseph Dart's invention of the grain elevator, Buffalo had become the world's largest grain port, surpassing Odessa, Russia; London, England; and Rotterdam, Holland." 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「Dart's Elevator」の詳細全文を読む スポンサード リンク
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