The Ruum by Arthur Porges:
Science Fiction Inventions, Technology and Ideas

"That favored theme of science fiction, the encounter between men and aliens from outer space, is so often told in such large-scale terms that it fails to achieve any sense of personal immediacy. With rare understanding of this problem, Mr. Forges confines his action to the struggle between one man, no greater or lesser than most of us, and a monstrously invincible collector of earth life-forms. As a result, only the most callous reader can fail to share the furious despair Jim Irwin knew in one terror-filled night in the north woods. "

You can read it here. Select an invention:

Ruum Spherical Robot
An autonomous spherical robot, possibly liquid metal, self-energizing, of alien design; a collector.

 

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