tympan

/tim-puhn/US // ˈtɪm pən //UK // (ˈtɪmpən) //

鼓膜,鼓楼,鼓风机,鼓包

Definitions

n.名词 noun

1
- : Printing. a padlike device interposed between the platen or its equivalent and the sheet to be printed, in order to soften and equalize the pressure.
- : tympanum.

Make several impressions, including one on the top tympan-sheet.
The bed traveled on guide ways, and the tympan and frisket were hinged to fold back and lay in elevated position.
In the cut at the head of this article, the pressman is represented as in the act of turning down the frisket upon the tympan.
Nothing remained now but to adjust the guides which would hold the cards on the tympan.
These sheets are held in place by means of the iron clamps which slip over the ends of the tympan (see Fig. 160).