Walter Gerlach, German physicist and academic (died 1979)

Walther Gerlach was a German physicist who co-discovered, through laboratory experiment, spin quantization in a magnetic field, the Stern–Gerlach effect. The experiment was conceived by Otto Stern in 1921 and successfully conducted first by Gerlach in early 1922. He was Nazi Germany's plenipotentiary of nuclear physics from December 1943 until his capture by US Army in May 1945.

August 1 is the 213th day of the year in the Gregorian calendar; 152 days remain until the end of the year.