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"I share the view of Pythagoras that the world is number. The ultimate substrate of the universe is math. There's no way to test that - it's pure metaphysical speculation."
- Bart Kosko

Gateway  
  A device that opens a portal to another dimension.  

Probably the first use of this term.

"Behold!" At the Wanderer's exclamation the enclosing sphere became transparent and they were in the midst of a dizzying maelstrom of flashing color. Brilliant geometric shapes, there were, whirling off into the vastness of space; as Bert had seen them in Tom Parker's instrument. A gigantic arc of rushing light-forms spanning the black gulf of an unknown cosmos. And in the foreground directly under the sphere was a blue-white disk, horizontally fixed—a substantial and familiar object, with hazy surroundings likewise familiar.

"Isn't that the metal platform in my friend's laboratory?" asked Bert, marveling.

"It is indeed." The mellow voice of the Wanderer was grave, and he laid a hand on Bert's arm. "And for so long as it exists it constitutes a serious menace to your civilization. It is a gateway to your world, a means of contact with your plane of existence for those many vicious hordes that dwell in other planes of the fifth dimension. Without it, the Bardeks had not been able to enter and effect the kidnaping of your friends."

Technovelgy from Wanderer of Infinity, by Harl Vincent.
Published by Astounding Stories in 1933
Additional resources -

Here is a copy of the original illustration from Astounding Stories of March, 1933.


(Gateway from Wanderer of Infinity)

The device that is used to travel from one dimension to another is described as a silvery sphere:

They stood in a spherical chamber of silvery metal, Bert and this giant, and the gentle vibration of delicately balanced machinery made itself felt in the structure. Of Joan and Tom there was no sign.

The idea of a silvery sphere that travels through dimensions or time is carried through to our time, as in this scene from Terminator 2: Judgement Day:

Compare to the gate from The Gate to Xoran (1931) by Hal K. Wells, the Invasion Gate for Aliens from Monsters of Mars (1931) by Edmond Hamilton, the Jiffy-Scuttler from Prominent Author (1954) by Philip K. Dick, Ramsbotham Gate from Tunnel in the Sky (1955) by Robert Heinlein, the farcaster from Hyperion (1989) by Dan Simmons.

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Additional resources:
  More Ideas and Technology from Wanderer of Infinity
  More Ideas and Technology by Harl Vincent
  Tech news articles related to Wanderer of Infinity
  Tech news articles related to works by Harl Vincent

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