Fuze Keeping Clock

A Mk V Fuze setting tray with a 4 in (102 mm) anti-aircraft (A/A) round. The Fuze setting tray received its fuze timing information, via electrical signals from the FKC, on a receiver dial. The operator then matched the settings on the receiver dial with the indicator dial on the tray, which then adjusted the clockwork mechanism in the A/A warhead to the calculated time of flight to the target.

The Fuze Keeping Clock (FKC) was a simplified version of the Royal Navy's High Angle Control System analogue fire control computer. It first appeared as the FKC MkII in destroyers of the 1938 Tribal class, while later variants were used on sloops, frigates, destroyers, aircraft carriers and several cruisers. The FKC MkII was a non-tachymetric anti-aircraft fire control computer. It could accurately engage targets with a maximum speed of 250 knots (460 km/h; 290 mph).

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