drum, membranophone, tympan(noun)
a musical percussion instrument; usually consists of a hollow cylinder with a membrane stretched across each end
a piece of cloth padding placed under the platen of a letterpress to distribute the pressure on the sheet being printed
the stretched membrane of a drum; a percussion instrument consisting of a hollow cylinder with such a membrane at each end
Origin: From tympanum.
a panel; a tympanum
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
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 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. ⁕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. 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 which absorbed the impact of the letterpress principle thus avoiding damage to the hand-set or pre-cast typography or engravings.
Chambers 20th Century Dictionary
tim′pan, n. an ancient Irish musical instrument: a frame covered with parchment or cloth, on which the blank sheets are placed to be impressed. [Fr.,—L. tympanum, a drum.]
The numerical value of tympan in Chaldean Numerology is: 5
The numerical value of tympan in Pythagorean Numerology is: 8