Alcoa - The aluminum cap atop the Washington Monument was installed in 1884, and it remains in service today. It's pictured here during a flag raising ceremony in 1934. #FlagDay | Facebook
![DVIDS - Images - Lantern Slide 19: Capstone and aluminum tip of the Washington Monument. [Image 11 of 20] DVIDS - Images - Lantern Slide 19: Capstone and aluminum tip of the Washington Monument. [Image 11 of 20]](https://d1ldvf68ux039x.cloudfront.net/thumbs/photos/2102/6524041/1000w_q95.jpg)
DVIDS - Images - Lantern Slide 19: Capstone and aluminum tip of the Washington Monument. [Image 11 of 20]
![Washington Monument. Aluminum cap of Washington Monument with lightning rods III - PICRYL - Public Domain Media Search Engine Public Domain Search Washington Monument. Aluminum cap of Washington Monument with lightning rods III - PICRYL - Public Domain Media Search Engine Public Domain Search](https://cdn4.picryl.com/thumbnail/1920/01/01/washington-monument-aluminum-cap-of-washington-monument-with-lightning-rods-2-200.jpg)
Washington Monument. Aluminum cap of Washington Monument with lightning rods III - PICRYL - Public Domain Media Search Engine Public Domain Search
American Council of the Blind - A model of the inscribed aluminum cap that sits at the top of the Washington Monument. | Facebook
![Washington Monument. Aluminum cap of Washington Monument with lightning rods I | Library of Congress Washington Monument. Aluminum cap of Washington Monument with lightning rods I | Library of Congress](https://tile.loc.gov/storage-services/service/pnp/thc/5a48000/5a48000/5a48083r.jpg)
Washington Monument. Aluminum cap of Washington Monument with lightning rods I | Library of Congress
![Replica of the Aluminum pyramid cap of the Washington Monument - Washington, DC USA Stock Photo - Alamy Replica of the Aluminum pyramid cap of the Washington Monument - Washington, DC USA Stock Photo - Alamy](https://c8.alamy.com/comp/DEMC3D/replica-of-the-aluminum-pyramid-cap-of-the-washington-monument-washington-DEMC3D.jpg)
Replica of the Aluminum pyramid cap of the Washington Monument - Washington, DC USA Stock Photo - Alamy
![Materials Witness: The Point of a Monument: A History of the Aluminum Cap of the Washington Monument Materials Witness: The Point of a Monument: A History of the Aluminum Cap of the Washington Monument](http://2.bp.blogspot.com/-2eMMS8t7l7g/VeuhmmF_KXI/AAAAAAAAV88/aYAXuDS2BvA/s1600/16586washmon.jpg)