These come in a wide variety of sizes and styles. They are used with backing boards for forming the swell of the book-block, and for many other binding operations.
Care of wooden presses. (This excellent advice comes from Edith Diehl’s classic “Bookbinding, Its Background and Technique”):
“The wooden screws of all presses should occasionally have a little soap applied sparingly to them in order to effect their smooth operation. When not in use, presses must not be left with their jaws open, but should be kept screwed up, though not too tightly, for wood is likely to swell, especially in warm [or humid] weather, and if the cheeks are left too tightly screwed together, even the strongest arm finds difficulty in budging them."
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