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"[Science fiction] is the only kind of writing that allows you to look at the world we live in and change one piece at a time."
- Frederik Pohl

Double-Door Vestibule  
  A special doorway leading from the interior of a spacecraft leading out into space which maintains the air pressure within the craft.  

Having lunched sumptuously on canned chicken soup, beef a la jardiniere, and pheasant that had been sent them by some of their admirers that morning, they put the bones and the glass can that had contained the soup into the double-doored partition or vestibule, placing a large sheet of cardboard to act as a wad between the scraps and the outside door. By pressing a button they unfastened the outside door, and the articles to be disposed of were shot off by the expansion of the air between the cardboard disk and the inside door; after which the outside door was drawn back to its place by a current sent through a magnet, but little power being required to reclose it with no resisting atmospheric pressure. As the electricity ran along a wire passing through a hermetically sealed opening in the floor, there was no way by which more air than that in the vestibule could escape; and as the somewhat flat space between the doors contained less than one cubic foot, the air-pressure inside the Callisto could not be materially lessened by a few openings.

"By filling the vestibule as full as possible," said Bearwarden, "and so displacing most of its air, we shall be able to open the outside door oftener without danger of rarefaction."

From A Journey In Other Worlds, by John Jacob Astor IV.
Published by D. Appleton and Co. in 1894
Additional resources -

Compare to airlock from Skylark of Space (1928) by E.E. 'Doc' Smith.

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Additional resources:
  More Ideas and Technology from A Journey In Other Worlds
  More Ideas and Technology by John Jacob Astor IV
  Tech news articles related to A Journey In Other Worlds
  Tech news articles related to works by John Jacob Astor IV

Double-Door Vestibule-related news articles:
  - Comercial Airlock 'Bishop' Now On ISS

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Could Increased Space Rocketry Damage The Ozone Layer?
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MOOSE: Man Out Of Space Easiest or Manned Orbital Operations Safety Equipment
NASA 'Holoports' Doctor Onto Space Station

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