Licence: Public Domain Mark
Credit: Fabry and Perot electrical equipment. Photograph, 1897. Wellcome Collection. Source: Wellcome Collection.
![no text alternative](https://iiif.wellcomecollection.org/image/V0030704/full/800%2C/0/default.jpg)
Licence: Public Domain Mark
Credit: Fabry and Perot electrical equipment. Photograph, 1897. Wellcome Collection. Source: Wellcome Collection.