Here is an excerpt from the patent on Zyklon: Wenn man den Inhalt der Buechse in duenner Schicht ueberstreut, verdunstet die Blausaeure in etwa 10 Minuten, so dass die Hoechstkonzentration des Gases im Raume mit ausserordentlicher Schnellighkeit erreicht wird. meaning The prussic acid will evaporate in appr. 10 min. if the contents of the can is strewn in a thin layer, so the maximum concentration of the gas in the room will be achieved with extraordinary speed. However, the grain size of the absorbent (diatomite) isn't defined in the patent, so this is certainly no proof in itself that such a short time would apply to the gas chambers. This is a ballpark, but more research is needed. Reference: Reichspatentamt. Patentschrift Nr 438818. Klasse 45l Gruppe 3. Ausgegeben am 27. Dezember 1926. Deutsche Gesellschaft fuer Schaedlingsbekaempfung m.b.H. in Frankfurt a.M. Verfahren zur Schaedlingsbekaempfung. Patentiert im Deutschen Reiche vom 20. Juni 1922 ab. Von dem Patentsucher ist als der Erfinder angegeben worden: Dr. Walter Heerdt in Frankfurt a.M.-Eschersheim.
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