Smithsonian Report, 1921. — Mitman. 



Plate 6. 



n 



i \ 



rlted 



ALUMINUM 

 15 LBS. 



»/VLIG! I I Gi en t v-.< icjl it in small 



b li 



■ ■ ■„ / -» 



'.STANCE to CORROSION 

 Mildly attacKed by ai ids 



l~Y: Readily b nt 



Some Important Properties of Lead. Photograph of a Group of Objects 

 in the Lead Exhibit, Division of Mineral Technology, United States 

 National Museum. 



604—5 



