ScientificAmerican1894-07-21.jpg Agate Nickel-Steel Kitchen Utensils -1900'sAThumbnailsScientific American 1901-08-10Agate Nickel-Steel Kitchen Utensils -1900'sAThumbnailsScientific American 1901-08-10Agate Nickel-Steel Kitchen Utensils -1900'sAThumbnailsScientific American 1901-08-10Agate Nickel-Steel Kitchen Utensils -1900'sAThumbnailsScientific American 1901-08-10Agate Nickel-Steel Kitchen Utensils -1900'sAThumbnailsScientific American 1901-08-10
Hardening composite plates for bank vaults by immersion in the Hudson River. hardening to make burglar-proof vaults.



Source: Steve Kirch, collector, and creator of a great website about SCIENTIFIC AMERICAN in the past

Restoration by: magscanner