Where a binding grips its leaves (through the fold, through the side or on the cut edge), how far the book opens as a result, and how each binding gives way; binding structure only, never book values, collecting or the history of individual old books.
Thread in the fold, stitches through the side, or glue on the cut edge: how each bookbinding method holds pages, how far it opens, and how it tends to fail.
Picture credit
"Sewing press, from The Art of Bookbinding" (1890), Joseph William Zaehnsdorf — https://commons.wikimedia.org/wiki/File:Art_of_Bookbinding_p056_Sewing_Press.png — Public domain in US: published 1890 (George Bell and Sons, London, second edition; first edition 1879), before 1931; DE/FR: published 1890 in a book by Joseph William Zaehnsdorf (d. 1930), engraver not named, so both life + 70 and 70 years from publication have expired
"Ehon Azuma asobi (Picture Book of Amusements of the Eastern Capital), cover" by Kitagawa Utamaro (attributed), Metropolitan Museum of Art — https://commons.wikimedia.org/wiki/File:%E7%B5%B5%E6%9C%AC%E5%90%BE%E5%A6%BB%E9%81%8A-Ehon_Azuma_asobi-Picture_Book_of_Amusements_of_the_Eastern_Capital_(Ehon_Azuma_asobi)_MET_JIB41_001.jpg — CC0 1.0 (https://creativecommons.org/publicdomain/zero/1.0/)
"Model Coptic binding" by Ratbasket at English Wikipedia — https://commons.wikimedia.org/wiki/File:Coptic_flat.jpg — CC BY 2.5 (https://creativecommons.org/licenses/by/2.5/); modified: lightly smoothed to reduce file size
"Morrison Perfection A Stitcher (stapler), c. 1890 - American Bookbinders Museum - San Francisco, CA" by Daderot — https://commons.wikimedia.org/wiki/File:Morrison_Perfection_A_Stitcher_(stapler),_c._1890_-_American_Bookbinders_Museum_-_San_Francisco,_CA_-_DSC08204.jpg — CC0 1.0 (https://creativecommons.org/publicdomain/zero/1.0/); modified: cropped
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