Halban Hans (2 results)

Hardcover. Condition: Good. ("The application of photoelectric cells to the measurement of light absorption in solutions.") Zeitschrift fur physikalishce Chemie, vol 96. pp 214-232 1920 ("An arrangement is described and illustrated diagrammatically by means of which light absorption in solution can be rapidly and accurately ascertained with the help of photoelectric alkali metal cells.") And: Hans van Halban and Heribrant Geigel, "Uber die Photochemie des Tetrbenzoylathylens 1", 233-250. Offered in the entire volume, including Hefts 1-6, 504pp. Bound volume with original wrappers bound in. Cloth, with leather spine labels. Xl Public Health Service. Good copy. $75.

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, 422). Halban, Joliot, and Kowarski reported that several free neutrons are released for each uranium that splits. Their experiments "recognized that under suitable conditions such secondary neutrons might in turn induce fission in other nuclei, setting in motion a chain reaction capable of sustaining itself until the uranium was entirely consumed" (Sikme, Lise Meitner: A Life in Physics, 261). The "experiments raised the prospect that fission might be used to generate immense quantities of energy" (ibid). CONDITION & DETAILS: London: Macmillan. 4to. (10.5 x 7.5 inches; 262 x 188mm). Original paper wraps with very slight remnants of creases within. Clean and bright inside and out.