Plotting board

Plotting Room, with Whistler-Hearn board.

A series of observed positions (blue circles) established the likely track of the target. Using the plotting board, the set forward point was determined, based upon the target's observed course and speed and an assumption about when the gun was to be fired.

A plotting board was a mechanical device used by the U.S. Coast Artillery to track the observed course of a target (typically a moving ship), project its future position, and derive the uncorrected data on azimuth (or direction) and range needed to direct the fire of the guns of a battery to hit that target. Plotting boards of this sort were first employed by the Coast Artillery around 1905, and were the primary means of calculating firing data until WW2.

单词	Plotting table
释义	Plotting table 英语百科 Plotting board A plotting board was a mechanical device used by the U.S. Coast Artillery to track the observed course of a target (typically a moving ship), project its future position, and derive the uncorrected data on azimuth (or direction) and range needed to direct the fire of the guns of a battery to hit that target. Plotting boards of this sort were first employed by the Coast Artillery around 1905, and were the primary means of calculating firing data until WW2.
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Plotting table

Plotting board