The Metal Giants by Edmond Hamilton:
Science Fiction Inventions, Technology and Ideas
A scientist creates an electronic brain with consciousness and is thrown out of his college; he takes his mechanical brain and disappears. Some years later, a farmer reports ten-foot circular tracks and seeing a giant metal man.
All manner of mayhem ensues.
(The Metal Giants)
An enormous vehicular robot in the shape of a gigantic wheel.
Enormous robots, cylindrical of body, tentacular of arms, autonomous of brain, sinister of intent.
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