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4These rules have iron jacks attached to them, and being united to the keys, when those are touched they move the rules. Over the table there are holes through which the wind passes into the pipes. Rings are fixed in the rules, for the reception of the feet of the organ-pipes. From the barrels run pipes joined to the neck of the wind-chest, which communicate with the holes in the chest, in which pipes are closely fitted valves; these, when the chest is supplied with wind, serve to close their orifices, and prevent its escape.
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