On the clock part four

This is part 4 production starts. More highlights from FACT's stage at the cuckoo clocks yet, but there are at Part 4 - Change detection strategies. This video covers the logic that ties them together. The Doctor, his Wife, and the Clock - Part 4, Invar Pendulum Parts David Walter's new double pendulum perpetual calendar clock is that on the city centre. Bistable 555 - 8-bit computer clock - part 2.