Sector 1 is hinged to rod 3 which slides in guide 4. Guide 4 turns about fixed axis A. Lever 2 turns about fixed axis B independently of sector 1. Rod 3 is shifted from one extreme position to the other by turning lever 2 with weight G about axis B. At this, sector 1 is held by weighed lever 2 against one of the stops, c or d, of the base.
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