Lever 1 with weight 5 turns about axis x. Lever 2 turns about fixed axis B and is linked to rod 3 which slides with considerable clearance in guide a. To shift rod 3 to its extreme left-hand position, the weight is transferred from position 5 to position 5' by turning lever 1 about longitudinal axis x of lever 2. After this weight 5 will be shifted by gravity to position 5", shifting lever 2 about pin B.
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