Description: Link Love: a weekly post with links to interesting videos and stories about archival issues, technology and culture, and Washington D.C. and American history.
Description: Watch how we make invisible Beatles’ autographs visible with Reflectance Transform Imaging, a technique for forensic document examination.
Description: The term “personal equation” came into use in the 19th century as scientists found that observers have inherent biases: some anticipate events, and some report events after they have occurred. Recognition of the problem led to a spate of personal equation instruments: some measured biases of this sort, and some reduced the effect of personal errors. Most of these
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.
Showing results 1 - 7 of 7 for Philosophical Society of Washington (Washington, D.C.)