Licence: Public Domain Mark
Credit: Technology: details of a lock mechanism. Engraving by A. Bell. Wellcome Collection. Source: Wellcome Collection.
![no text alternative](https://iiif.wellcomecollection.org/image/V0024307/full/800%2C/0/default.jpg)
Licence: Public Domain Mark
Credit: Technology: details of a lock mechanism. Engraving by A. Bell. Wellcome Collection. Source: Wellcome Collection.