stadimeter การใช้

Among Fiske's improvements were an improved stadimeter, helm-angle indicator, engine-room telegraphs, speed and direction indicators, a turret range finder, a gun director system, and steering telegraphs.
In 1908, the death of Ellis and the destruction of his stadimeter were cited in an article in the United States Naval Institute Proceedings as to the impracticality of using observers aloft or in an exposed position on deck to determine range to targets during an actual battle, as opposed to gunnery practice.