How about this for a truism: a book is a book, and something that is not a book is not a book. This post will knock your socks off if you are inclined to affirm this statement, because in medieval times a book could be so much more than that. As it turns out, tools were sometimes attached to manuscripts, such as a disk, dial or knob, or even a complete scientific instrument. Such ‘add-ons’ were usually mounted onto the page, extending the book’s primary function as an object that one reads, turning it into a piece of hardware.
Adding such tools was an invasive procedure that involved hacking into the wooden binding or cutting holes in pages. In spite of this, they were quite popular in the later Middle Ages, especially during the 15th century. This shows that they served a real purpose, adding value to the book’s contents: some clarified the text’s meaning, while others functioned as a…
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