An old lady asking her doctor about 'Violet Ray', referring to ultra violet rays. Reproduction of a drawing after H.M. Brock, 1925.
- Brock, H. M. (Henry Matthew), 1875-1960.
- Date:
- 1925
- Reference:
- 15453i
Licence: In copyright
Credit: An old lady asking her doctor about 'Violet Ray', referring to ultra violet rays. Reproduction of a drawing after H.M. Brock, 1925. Wellcome Collection. Source: Wellcome Collection.
