The Linda Hall Library, a unaffiliated archive of historical science and engineering documents in Kansas City, MO has been working on digitizing their remarkable collection. One of the nice things they've done is have pre-defined searches, for example the history of the parachute, or their archive of documents related to the building of the panama canal. The most interesting, however, is their collection of books on timekeeping. They haven't put up complete books yet, but have illustrations many of the 16th and 17th century sources of note, including Ferdinand Berthoud, Alexander Cumming and some of the engravings from Diderot and de l'Ambert's Encyclopedia.
Go take a look!
Cardano, Girolamo, 1557. De rerum varietate libri XVII. Woodcut on p. 365
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