The First Known Antiparticle

The First Known Antiparticle (HM2BX4)

Location: Pasadena, CA 91125
Buy California State flags at!
Country: United States of America
Buy United States of America flags at!

N 34° 8.203', W 118° 7.55'

  • 0 check ins
  • 0 favorites

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.
HM NumberHM2BX4
Placed ByAmerican Physical Society
Marker ConditionNo reports yet
Date Added Tuesday, October 2nd, 2018 at 11:02pm PDT -07:00
Sorry, but we don't have a picture of this historical marker yet. If you have a picture, please share it with us. It's simple to do. 1) Become a member. 2) Adopt this historical marker listing. 3) Upload the picture.
Locationbig map
UTM (WGS84 Datum)11S E 396196 N 3777887
Decimal Degrees34.13671667, -118.12583333
Degrees and Decimal MinutesN 34° 8.203', W 118° 7.55'
Degrees, Minutes and Seconds34° 8' 12.18" N, 118° 7' 33" W
Driving DirectionsGoogle Maps
Area Code(s)626
Closest Postal AddressAt or near , Pasadena CA 91125, US
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

Is this marker missing? Are the coordinates wrong? Do you have additional information that you would like to share with us? If so, check in.

Nearby Markersshow on map
Check Ins  check in   |    all

Have you seen this marker? If so, check in and tell us about it.

Comments 0 comments

Maintenance Issues
  1. Is this marker part of a series?
  2. What historical period does the marker represent?
  3. What historical place does the marker represent?
  4. What type of marker is it?
  5. What class is the marker?
  6. What style is the marker?
  7. Does the marker have a number?
  8. What year was the marker erected?
  9. This marker needs at least one picture.
  10. Can this marker be seen from the road?
  11. Is the marker in the median?