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t:tympan-sheet [2018/03/30 02:07] (current)
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 +<< [[contents:​index| Dictionary Index]] << [[contents:​t|Definitions under T]]
  
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 +====== Tympan Sheet ======
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 +A sheet of [[p:​paper|paper]] pasted on the [[t:​tympan|tympan]] at the corners, as a standing mark to lay all the other sheets exactly even upon, while the [[w:​white-paper|white paper]] is working. — //M//. It is now also used for the[[r:​reiteration| reiteration]]. When a pressman has laid a [[f:​form|form]] on the [[p:​press-stone|press stone]], and fixed it in its situation, he takes a sheet of its own paper, or a sheet of some other paper of the same size, and folds it exactly, so that the folds shall be his guide for laying it on the form; he then lays a sheet of [[w:​waste|waste paper]] on the form to preserve his tympan sheet clean, and places it truly on the form over the other, by means of the folds falling on the middle of the [[c:​cross|crosses]] and feeling the types through it with his fingers, so that the [[m:​margin|margin]] at both sides of the sheet shall be precisely equal, as also at both ends; he wets his tympan slightly, to take out the indentions made by the types of a preceding form, and generally rubs a very small quantity of paste on the [[p:​parchment|parchment]],​ being careful that there are no lumps; he then turns the tympan down upon the form, runs in the [[c:​carriage|carriage]],​ and gives it a slight pull, to cause it to adhere to the tympan; he then pastes the four corners down, but tears off a piece of the near bottom corner, to prevent him catching hold of it, in the quick taking the printed sheet off the tympan, when working. ​
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