Number of neutrons Liberated in the Nuclear Fission of Uranium in Nature 143, no. 3625, April 22, 1939, p. 680.
London: Macmillan, 1939. 1st Edition. FIRST EDITION IN ORIGINAL WRAPS of the first solid evidence that neutron multiplication is large enough (3.5) to creat a chain reaction, thus profiding "indirect proof of the neutron multiplication accompanying the fission of uranium nuclei after neutron capture" (Printing and the Mind of Man..... More