A ship on the surface of the sea … degree of freedom -- that of the direction … This problem is easily and adequately solved by … a road of limited width automatically dealing with … practice upon two degrees of freedom [since the car must follow the road as well as maintain direction] … [an apparatus requires distance to center line, orientation to center line, curvature of road, comparator system, suppression of incidental swing.] This great increase in complexity is a …
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