Sector clock
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A sector clock or colour change clock was a round colour-coded clock used at military airfields and observation posts in the United Kingdom to help track the movements of enemy aircraft and coordinate and control air defences.
A sector clock or colour change clock was a round colour-coded clock used at military airfields and observation posts in the United Kingdom to help track the movements of enemy aircraft and coordinate and control air defences. ==Gallery== File:Sector clock.JPG|RAF-issue sector clock. Coloured triangles span 5 minute time periods. Outward pointing triangles indicate the model shown to have a mechanical mechanism. File:RAF Digby Ops Room.jpg|RAF Digby Operations Room with a sector clock displaying inward pointing triangles, typical of electrical models. This clock appears to show a key aperture below the dial and may be mechanical. File:The Royal Observer Corps, 1939-1945. CH11336.jpg|ROC-issue electrical and mechanical sector clocks in the No. 19 Group (Bromley) Operations Room. Mechanical models were often paired with electrical types as a backup in the event of power outages. File:100 years of the RAF MOD 45163760.jpg|Electrical sector clock above the plotting table at headquarters Fighter Command, RAF Bentley Priory. File:Royal Observer Corps necktie.jpg|An RAF sector clock-themed wristwatch. ROC tie with matching NATO watch strap. ==See also== Battle of Britain Bunker Dowding system ==References== ==External links==
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