Instead, the sight mount had both Tangent Elevation ( TE ) and Angle of Sight Scales and a separate Gun Rule to convert range into TE, corrected for the muzzle velocity variation from standard.
2.
Since the light gun entered service after the introduction of field artillery computer equipment ( FACE ), it never, unlike the Abbot, had gun rules ( large slide rule like instruments used at each gun to convert range in metres to tangent elevation in mils, taking account of muzzle velocity ).
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