35°9′N 106°47′W / 35.150°N 106.783°W / 35.150; -106.783 The Volcano Ranch experiment was an array of particle detectors in Volcano Ranch, New Mexico, used to measure ultra-high-energy cosmic rays. The array was built by John Linsley and Livio Scarsi in 1959. On February 22, 1962, Linsley observed an air shower at Volcano Ranch created by a primary particle with an energy greater than 10²⁰ eV, the highest energy cosmic ray particle ever detected at the time. Linsley continued to operate Volcano Ranch until 1978, when it was closed due to lack of funding.

• "Finding Aid to the John Linsley Papers". Fermilab History and Archives Project, Fermi National Accelerator Laboratory. 2012. Retrieved 21 September 2012.
• Nagano, M.; Watson, A. A. (July 2000). "Observations and implications of the ultrahigh-energy cosmic rays". Rev. Mod. Phys. 72 (3): 689–732. Bibcode:2000RvMP...72..689N. CiteSeerX 10.1.1.1029.7236. doi:10.1103/RevModPhys.72.689.