These are anchor rings for artillery pieces that were used pre-WWI … The artillery was never fired except in practice. These are at Fort Worden State Park … and there were two other forts (Casey and Flagler) that together guarded the entrance to Puget Sound and the naval stations and boatyards in Seattle, Bremerton and Everett.
All these were used in the emplacement shown at the bottom. I thought they made an interesting study.
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