work statement links home contact calender scrapbook 'pendulum' - pneumatic/steel construction

user presses switch which retracts T bar, when fully retracted T bar lies under hooks attached to pendulums. Switch is released T bar rises up catches hold of hooks and consquently lifts both pendulums, they reach just above the horizontal and T bar slips the hooks. Pendulums fall and swing for approx.15 mins.