Barrier Across a Canal and a Balance of Force
A force grows weaker the farther it acts from its cause
A latticework barrier or sluice is drawn across a canal at the top of the sheet, captioned with a span of six braccia. Below, a horizontal balance beam marked a and b illustrates Leonardo's rule that a force is weaker the more distant it is from its cause. If the cause of the force lies at b, it is certainly weaker there than at a.
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Barrier across a canal
A barrier or sluice is set across a canal, its span given as six braccia.
Force weaker with distance from its cause
A balance beam is marked a and b. That force will be weaker which is more distant from its cause; if the cause of the force lies at b, it is certainly known to be weaker than at a.