Pasadena in Los Angeles County, California — The American West (Pacific Coastal)
The First Known Antiparticle
Historic Physics Site
Near this site, in August 1932, Carl David Anderson photographed the track of a cosmic ray particle in his cloud chamber. He identified this particle as the positron — the first known antiparticle.
Historic Physics Site, Register of Historic Sites, American Physical Society.
Erected by American Physical Society.
Location. 34° 8.203′ N, 118° 7.55′ W. Marker is in Pasadena, California, in Los Angeles County. Marker can be reached from California Boulevard 0.1 miles east of Wilson Avenue. Touch for map. Located on the Cal Tech campus, at the north-east corner of the Bridge Labs Buildings. Marker is at or near this postal address: 1200 E California Boulevard, Pasadena CA 91125, United States of America.
Other nearby markers. At least 8 other markers are within 2 miles of this marker, measured as the crow flies. Throop Memorial Garden (about 300 feet away, measured in a direct line); Iris Garden (about 400 feet away); Beckman pH Meter (approx. 0.2 miles away); Camellia Japonica ‘California’ (approx. 0.9 miles away); Pacific Asia Museum (approx. 1.1 miles away); The Millstones Pasadena Robinson Memorial (approx. 1.3 miles away); Brainard Alley (approx. 1.4 miles away). Touch for a list and map of all markers in Pasadena.
Categories. • Education • Science & Medicine •
Credits. This page was last revised on October 2, 2018. This page originally submitted on October 2, 2018, by Craig Baker of Sylmar, California. This page has been viewed 33 times since then. Photos: 1, 2, 3. submitted on October 2, 2018, by Craig Baker of Sylmar, California. • Andrew Ruppenstein was the editor who published this page.