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Tympan Hooks

Small hooks fixed on the upper side of the outer tympan, which assist in keeping the inner tympan in its place.

There are four of them, two on the off side and two on the near side, screwed to the tympan, but not so tight as to prevent them turning round on the screws as centres; there are four eyes screwed on the inner tympan, opposite to them, and the hooks turn into these eyes and draw the sides of the tympans together, and assist in tightening the parchment of the inner tympan, and prevent its moving. In iron presses, instead of eyes, buttons are used on the inner tympan, and the hooks turn round them under the heads, and produce the same effect.

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