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: Our treasures can pose significant—and often unexpected—challenges, like when a map has been attached to a hotel linen. See how our staff tackled a complex intervention in progress!