MONTAGE People dance a reel with precision time clock / UK 影片檔

Two lines of dancers appear in a dance hall / people folk dance in pairs / needles sweep in dials / dancers form lines / needle points at numbers in dial / woman dance past each other / clock pendulum swings / man nods rhythmically / gear with numbers turns / man dances / pens draw lines on paper tape / woman hold hands and spin / display plots wave graph / dancers hold hands / numbers change on tube display / dancers reel