Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Aluminum cap piece on Washington monument
To prevent damage by lightning, builders placed small pyramid of aluminum, properly grounded, at top; recent inspection showed metal to have withstood 50-hr exposure perfectly; aside from some marks left by lightning strokes no damage is discernible; surface oxide has not obliterated finely engraved inscriptions.
Aluminum cap piece on Washington monument
To prevent damage by lightning, builders placed small pyramid of aluminum, properly grounded, at top; recent inspection showed metal to have withstood 50-hr exposure perfectly; aside from some marks left by lightning strokes no damage is discernible; surface oxide has not obliterated finely engraved inscriptions.
Aluminum cap piece on Washington monument
Metal Progress
Dix, Jr., E.H. (Autor:in)
Metal Progress ; 26
1934
3 pages
Aufsatz (Zeitschrift)
Englisch
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