Time keeping clock weight ~ 1/2 lb weight descend time ~ 60min. hour, minutes and seconds hands gearwork: 36 / 12 = 3 40 / worm = 40 40 / 16 = 2.5 3*40*2.5 = 300 1hour=3600seconds 3600seconds/300 = 12seconds Witch means the escapement wheel turns once every 12 seconds 300 times an hour. Witch means the pendulum makes a complete (tic-tac) movement every second. more informations avaiable on request at moosejaw_21@hotmail.com