Magnetic compass binnacle with red & green balls to compensate for magnetic distortion of iron sailing ship Balclutha at Maritime National Historical Park. San Francisco, CA.

Magnetic compass binnacle with red & green balls to compensate for magnetic distortion of iron sailing ship Balclutha at Maritime National Historical Park. San Francisco, CA.
Photo by Jim Steinhart © 2015, all rights reserved. (Ref: CAFTE440)

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