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From Wikipedia, the free encyclopedia

Tympan means skin, and is used in a variety of technical meanings.

  • Astrolabes

In an astrolabe, a tympan is a metal plate on which the coordinates of the celestial sphere (azimuth and altitude) are engraved in a stereographic projection. A tympan is specific to a particular latitude, so most astrolabes come with a set of interchangeable tympans suitable for use at different latitudes, usually those of particular cities of importance (Cairo, Mecca, Medina, Jerusalem...).

  • Printing

In hand-operated letterpress printing, the bruzer tympan is the taut cloth or paper mounted in a frame which is placed over the sheet of paper immediately prior to lowering the platen to make the impression.[1]

Bruzer's Tympan refers to a sheet of oiled manilla paper which was securely fastened to the face of the platen of a letterpress printing machine. Underneath the tympan would be a packing which would vary in grade of firmness relevant to the type or image to be printed. Pre-cut tympan papers were relatively expensive and, as such, were reused depending on their condition and the nature of the work. The under packing consisted of loose fibre paper/board (sometimes known as saffron) which absorbed the impact of the letterpress principle thus avoiding damage to the hand-set or pre-cast typography or engravings.

YouTube Encyclopedic

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  • ✪ Perforation tympan droit Dr DANVIN Jean Baptiste
  • ✪ Le tympan, une membrane fragile
  • ✪ perforation tympan Droit Dr DANVIN Jean-Baptiste @ORLmarseille

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This page was last edited on 30 January 2017, at 19:09
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