Description: When curators at the Smithsonian National Museum of American History looked at seven radiometers in storage, they learned the instruments had been at the Smithsonian for nearly one hundred fifty years.
Description: [edan-image:id=siris_arc_287602,size=250,left]As a child in England in the 1930s, Oliver Sacks enjoyed playing with his Uncle Abe’s spinthariscope. It was, he would later recall, “a beautifully simple instrument, consisting of a fluorescent screen and a magnifying eyepiece, and inside, an infinitesimal speck of radium.We take a look at the spinthariscope at the Smithsonian.