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Installed in 1884, the aluminum cap on the Washington Monument is still in service. Alcola. Enlargement: Aluminum tip of the Washington Monument with brass collar that holds lightning rods and brass rods extending down each side of the monument. NOAA.  



  1. Aluminium, Wikipedia


  1. History of Aluminium, International Aluminum Institute
  2. Binczewski, George J. The Point of a Monument: A History of the Aluminum Cap of the Washington Monument. JOM, 47 (11) (1995), pp. 20-25.


  1. Myers John H. and Gary L. Hume. Aluminum and Vinyl Siding on Historic Buildings: The Appropriateness of Substitute Materials for Resurfacing Historic Wood Frame Buildings. Preservation Briefs 8, TPS, Washington, DC:TPS, National Park Service, USDI, 1984.


  1. International Aluminum Institute