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[ScottW]

Hey Y'all;
Just came across this nice description of the operation of British WW1 battleship gun directors;
https://lonestarbattleship.tumblr.com/post/695566855869480960/fire-control-directors-part-iii-by-the-middle

“By the middle of WWI, the director was key to firing at an enemy in low visibility; with plotting, it could theoretically keep track of an obscured target. They also took much of the guesswork out of target designation - no longer was there a need to guess which target the rangefinder operator was using, or which one the bridge wanted targeted. Simply put, directors were capable of generating firing data of a complexity that rangefinders could not, and staying on a specified target in the worst conditions.
For example, a British WWI-era director, installed on a mast with an enclosed working space for a Talker, a Layer, a Trainer, and a Sight-Setter, would function as follows: