Tympan

Tympan means skin, and is used in a variety of technical meanings. 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 u...
Found on http://en.wikipedia.org/wiki/Tympan

Tympan

• (n.) A frame covered with parchment or cloth, on which the blank sheets are put, in order to be laid on the form to be impressed. • (n.) A drum. • (n.) A panel; a tympanum.
Found on http://thinkexist.com/dictionary/meaning/tympan/

tympan

(from the article `printmaking`) To print, the printing paper is first placed on the stone, followed by a newsprint paper, and then a blotter. Last comes the tympan, a sheet of ...
Found on http://www.britannica.com/eb/a-z/t/99

Tympan

In printing, a tympan is a frame covered with parchment or cloth, on which the blank sheets are put, so as to be laid on the form to be impressed.
Found on http://www.probertencyclopaedia.com/browse/AT.HTM
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