1(In letterpress printing) a layer of packing, typically of paper, placed between the platen and the paper to be printed to equalize the pressure over the whole forme.
- The pressman pulled on the bar, causing the platen to press the tympan on the inked type and taking the impression.
- Jacques Derrida, in the preface to Margins of Philosophy, identifies the printing press-specifically, the ‘tympan’ as the agent of division.
- One last point, however: when the card is removed the original image on the tympan sheet will be exposed.
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