1. Rev. Sci. Instr. (the September 1953 issue is devoted to a description of the Brookhaven cosmotron).
2. Oliphant, M. L., Gooden, J. S., and Hide, G. S., Proc. Phys. Soc., 59, 666 (1947).
3. Nature, 169, 476 (1952).
4. Hibbard, L. U., Nucleonics, 7, No. 4, 30 (1950); see also The Engineer, 195, 271 and 305 (1953).