The vast majority of surviving sector clocks are those with mechanical movements which were generally distributed throughout the Royal Air Force and their airfield bases. The RAF sector clock formed a vital role in the fight for British air supremacy during the Second World War. The inside of the front door is applied with a brass plaque engraved AIR MINISTRY No. The oak-cased Master clock is signed SYNCHRONOME ELECTRIC on the silvered dial with Roman numerals and blued steel spade hands, the movement of typical Synchronome form with pawl and wheel ‘escapement’ and cylindrical bob pendulum and beat scale in the base. The small electro-mechanical movement receiving a 30 second impulse from the Master. The Slave sector clock having an 18-inch diameter painted iron dial with blue, red and yellow inward-pointing triangles every 2-½ minutes with outer markers and inner 12 and 24 markers and counterbalanced black painted hands. Sector Clock 22 ½ inches diameter - Master Clock 50 ½ inches highĪn extremely rare second world war RAF electric sector slave dial with Synchronome Master made for the Royal Observer Corps.
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