Pit sword

The pit sword (also known as a rodmeter) is a blade of metal or plastic that extends into the water beneath the hull of a nautical vessel. ^[1] It is part of the pitometer log, a device for measuring the ship's speed through the water.

External links

Commercial web site showing a typical pitometer log system.
Historical site with information on US Navy submarine pitometer log systems during World War II. This site shows the pit sword or rodmeter as it is deployed.

References

↑ "Underwater Log Systems". USS Bowfin Submarine Museum & Park. 2002. Archived from the original on 2006-08-25. Retrieved 2006-08-26.

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