Smithsonian Report, 1913. — Scott. 



Plate 2. 



Fig. 1.— Rjukan Saltpeter Factory. 

 View of furnace room showing some of the Schonherr furnaces. 



Fig. 2.— Rjukan Saltpeter Factory. 

 View of furnace room showing twelve of the Birkeland-Eyde furnaces. 



