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View of the periscope tube above the optics.

Picture 2 of 2.

This periscope has a focal length of 40 feet, and each foot is marked off on the periscope tube.

 
Periscope tube, including foot markings, at Wisconsin Maritime Museum
Time picture taken Sat Sep 25 11:24:48 2010
Location picture taken Museum Galleries
Wisconsin Maritime Museum
Manitowoc, Wisconsin
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