aha. my time to shine. I was a Fire Controlman in the Navy.
it’s heavily associated with old fashioned Naval gunnery. the firing “solution” is the result of several mathematical calculations done to account for the pitch and roll of the ship, the range of the target, and the predicted trajectory of the shell. In the modern day we have computers to do the heavy lifting. But back in the day there were only extremely simple tools like…
an object suspended from the overhead by a string, in order to help the gunner visualize where the deck of the ship was in relation to the horizon. Since gravity is pulling straight down, ya know. a physical rangefinder with two lenses a set distance apart, can be dialed to focus the two disparate images and it gives you an estimated range based on how the left/right lenses are pointed.
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