page_title: Director (military)
section_title: Anti-aircraft
hierarchical_section_title: Director (military) / Anti-aircraft
caption_attribution_description: English: This is a photograph of an anti-aircraft analogue computer, situated in the Matiu/Somes Quarantine Station, Wellington Harbour, New Zealand. Plate inscribed "Predictor 3.7 inch AA No. 1 Mk III VA LTD 1942 no. 1086"
context_page_description: A director, also called an auxiliary predictor, is a mechanical or electronic computer that continuously calculates trigonometric firing solutions for use against a moving target, and transmits targeting data to direct the weapon firing crew.
context_section_description: For anti-aircraft use, directors are usually used in conjunction with other fire control equipment, such as height finders or fire control radars.  In some armies these 'directors' were called 'predictors'. The Mark 51 director was used by the US Navy for 40 mm guns and later for 3"/50 caliber guns. The Kerrison Predictor was also designed to be used with the Bofors 40 mm gun.
caption: A Vickers No.1 Mk III predictor for the British QF 3.7-inch anti-aircraft gun
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