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Gun Rule for the BL 5.5-inch

The gun rule is a type of slide ruler that converts range and angle of sight into quadrant elevation for artillery pieces. This is the gun rule for the BL 5.5-inch gun.

Gun rule for the BL 5.5-inch gun.
The top line of figures (Tangent Elevation degrees) runs from 4 to 45.
The second line of figures (Range hundreds of yards) runs from 15 to 85.
The lower line of figures (Muzzle Velocity) runs from 2100 to 1500 feet per second.
Click the image to read the article about gun rules.

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