Description: [caption id="" align="alignleft" width="251" caption="Joseph Henry, first Secretary of the Smithsonian Institution (1846-1878), and his wife, Harriet Henry, and their daughters Caroline, Helen and Mary with croquet mallets on the grounds of the Smithsonian Institution Building, c.
Description: Joseph Henry,the first Smithsonian Secretary, served from 1846 to 1878 and was a physicist who conducted pioneering research in electromagnetism.