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TOOL (0. Eng. tdl, generally referred...

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Originally appearing in Volume V27, Page 14 of the 1911 Encyclopedia Britannica.
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TOOL (0. Eng. tdl, generally referred to a See also:root seen in the Goth. taujan, to make, or in the See also:English word " taw," to See also:work or See also:dress See also:leather)  , an See also:implement or appliance used by a worker in the treatment of the substances used in his handicraft, whether in the preliminary operations of setting out and measuring the materials, in reducing his See also:work to the required See also:form by cutting or otherwise, in gauging it and testing its accuracy, or in duly securing it while thus being treated . For the tools of prehistoric See also:man see such articles as See also:ARCHAEOLOGY ; See also:FLINT IMPLEMENTS; and See also:EGYPT, § See also:Art and Archaeology . In beginning a survey of tools it is necessary to draw the distinction between See also:hand and See also:machine tools . The former class includes any See also:tool which is held and operated by the unaided hands, as a See also:chisel, See also:plane or saw . Attach one of these to some piece of operating mechanism, and it, with the environment of which it is the central essential See also:object, becomes a machine tool . A very See also:simple example is the See also:common See also:power-driven hack saw for See also:metal, or the small high-See also:speed See also:drill, or the See also:wood-See also:boring See also:auger held in a See also:frame and turned by a winch handle and See also:bevel-gears . The difference between these and a big frame-saw cutting down a dozen boards simultaneously, or the immense machine boring the cylinders of an ocean See also:liner, or the See also:great See also:gun See also:lathe, or the See also:hydraulic See also:press, is so vast that the relationship is hardly apparent . Often the tool itself is absolutely dwarfed by the machine, of which nevertheless it is the central object and around which the machine is designed and built . A milling machine weighing several tons will often be seen rotating a tool of but two or three dozen pounds' See also:weight . Yet the machine is fitted with elaborate slides and self-acting movements, and See also:provision for taking up See also:wear,and is See also:worth some hundreds of pounds See also:sterling, while the tool may not be worth two pounds . Such apparent anomalies are in See also:constant See also:evidence . We propose, therefore, first to take a survey of the principles that underlie the forms of tools, and then pursue the subject of their embodiment in machine tools .

End of Article: TOOL (0. Eng. tdl, generally referred to a root seen in the Goth. taujan, to make, or in the English word " taw," to work or dress leather)
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THOMAS TOOKE (1774-1858)
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JOHN LAWRENCE TOOLE (1832-1906)

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