Description: Henry David Hubbard (1870-1943), a physicist at the U.S. National Bureau of Standards, designed the first edition of the "Periodic Chart of the Atoms" in 1924. The chart is still in use today, continually updated to reflect new elements.
Description: At a September 27, 1931, symposium about the evolution of the universe, Watson Davis photographed astronomer Abbé Georges Henri Joseph Édouard Lemaître, physicist Sir Oliver Lodge, astrophysicist Edward Arthur Milne, and Anglican bishop and mathematician Ernest William Barnes.