Monuments et sites historiquesLaboratory of George Ellery Hale, inventor of the spectroheliograph, with which he made his discoveries of the solar vortices and magnetic fields of sun spots. Photo: Shinku Hisaki ( talk ), CC BY 3.0, via Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Hale_Solar_Laboratory_2008.jpg)
