I. Flux of Low Energy Protons at Sea Level. II. Other Phenomena Involving Particles of Greater than Minimum Ionization

A proportional counter has been installed in a six-inch cloud chamber with a magnetic field of 6400 gauss. By use of the proportional counter as a selection device, pictures o£ more than 200 low energy protons have been obtained in a time of somewhat over a year's duration. From these the absolute intensity of the low-energy proton component of cosmic rays has been determined at sea level. A spectrum of fifty electrons resulting from mu-meson decays has been obtained as well as other data on mu-mesons. Photographs of typical low-energy protons, mu-meson decays, and other interesting events are presented. In addition several interesting pictures are discussed in detail.