Alexander Dallas Bache was an American physicist, scientist, and surveyor who erected coastal fortifications and conducted a detailed survey to map the mideastern United States coastline. Originally a
A 19th century illustration of Bache and his signature
Bache's gravesite at Congressional Cemetery in Washington, D.C.
Joseph Henry was an American physicist and inventor who served as the first secretary of the Smithsonian Institution. He was the secretary for the National Institute for the Promotion of Science, a pr
Henry, c. 1865–1878
Historical marker in Academy Park in Albany commemorating Henry's work with electricity
A portrait of Henry dated 1879
Henry's letter at the beginning of the 1876 annual report of Smithsonian Institution, showing the operations, expenditures, and condition of the institution that year