Description: The Freer Gallery of Art houses the Asian and impressionist art collection of Charles Lang Freer, who donated art works and an endowment to the Smithsonian in 1906. In 1982, Arthur M. Sackler donated a complementary collection housed in the Sackler Gallery in the Smithsonian Quadrangle Complex adjacent to the Freer. History of the Freer Gallery of Art and the Arthur M. Sackler
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