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Tympan Sheet

A sheet of paper pasted on the tympan at the corners, as a standing mark to lay all the other sheets exactly even upon, while the white paper is working. — M. It is now also used for the reiteration. When a pressman has laid a form on the 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 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 crosses and feeling the types through it with his fingers, so that the 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 parchment, being careful that there are no lumps; he then turns the tympan down upon the form, runs in the 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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