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Inner Tympan

A frame covered with parchment, which fits into the outer tympan; two flat points slip under the head-band of the outer tympan, which secure that end in its place; and the sides are kept down by two hooks on each side of the outer tympan which turn into eyes screwed into the sides of the inner tympan; in iron presses the hooks turn round studs, under the heads.

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