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b:button-tympan [2018/03/30 02:05] (current)
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 +<< [[contents:​index| Dictionary Index]] << [[contents:​b|Definitions under B]]
 +====== Button Tympan ======
 +An iron button with a female screw, screwed on a square [[s:​shank|shanked]] bolt, that goes through the bottom [[f:​frame|frame]] of the outer [[t:​tympan|tympan]],​ in wooden presses, and turns on the upper side of the [[i:​inner-tympan|inner tympan]], to assist in keeping it tight in its place. ​
 +In very fine work also, when the [[p:​paper|paper]] is stout and heavy and large sheets, and it is not customary to fly the [[f:​frisket|frisket]],​ but to turn it down upon the paper before the tympan is turned down upon the form, a button is placed upon the lower frame of the outer tympan, which clasps ​
 +the extreme end of the frisket, and confines the sheet of paper in its place on the tympan, and prevents it slipping down.