Figure from ROBOT,
Moravec,
Oxford,
1998, Chapter 2: Caution! Robot Vehicle!, page 19
1964-Two early versions of the ``Hopkins
Beast'' feeding at a wall outlet
These machines
wandered hallways guided by sonar and found sockets by feeling along
walls. In subsequent work, the larger unit was given another layer
containing a photocell circuit that allowed it to find contrasting
wall plugs optically from a distance.
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