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"By the time I can take people out to where Hubble is looking, they won't be human anymore, by a long way."
- Larry Niven

Attractive Ray  
  A beam of radiation that pulls.  

This is a very early reference to what sci-fi fans have come to refer to as the "tractor beam." The term tractor beam occurs first in E.E "Doc" Smith's Spacehounds of IPC three years later.

A spark of intense white light had suddenly broken into being on the platform beneath us, a beam of blinding light that sabbed straight up toward us, bathing the cruiser in its unearthly glow. And suddenly our ship was falling!

Sarto Sen sprang to the controls wrenched around the power-lever. "That ray!" he cried. "It's attractive! - it's pulling us down!" Our ship was vibrating now to the full force of its generators, but still we were falling...

From Crashing Suns, by Edmond Hamilton.
Published by Popular Fiction Publishing Co. in 1928
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