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A piece of rubber, felt, or woolen cloth, used in the tympan to make it soft and elastic.

Dainty, delicate, its rose-colored columns of granite appeared too thin for tangible weight; the tympan's sculptured designs, fanciful as the carvings in some palace of a poet's dreams.

Setting off may be prevented by slightly greasing or oiling a sheet which may be placed on the tympan if in press work, or the cylinder if at a machine.

This façade is of the fifteenth century and on the tympan of the dormer windows one may still see the monogram of its builder, Cottereau.

Mechanisms are employed to move the "tympan sheet" or outside covering of the second cylinder along at fixed intervals, but they are complicated and troublesome.