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CATALYSIS IN THE INORGANIC FIELD 



105 



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Fig, I. (Courtesy of Journal of Industrial and Engineering Chemistry.) 



8. Diagram of Bucher's apparatus for making sodium cyanid (Fig. i), with the 

 charge continuously moving. This apparatus is designed "to keep the final con- 

 centration of alkali in the briquets just the same as at the beginning, because what- 

 ever distilled from the heat- zone, would have to return to it." 



9. Diagram of Bucher's apparatus for the use of air or producer gas in place of 

 pure nitrogen (Fig. 2). Several inches of layers of coke were held in position in the 

 tube with iron screens, and another screen kept the briquets away from the porous 

 absorbing surface of the coke. The (iron) pipe was heated to the cyanizing tempera- 



