Patent:GB153326

"Gunnery calculators.-In anti-aircraft gunnery, the gun corrections to be applied in respect of parallax at the observing station on account of drift and angle of site are ascertained by means of two coaxial and relatively-adjusted graduated sectors 14, 15 pivoted at r and moved automatically by connection with the gun through the cam 12 shaped to give movements proportional to log. tan S where S is the angle of site."

• DATUM: 07.04.1921
• TITEL: Improvements relating to the aiming of anti-aircraft guns
• PERSON: FRANCE ETAT

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