The inside part of a dirigible

Title (Dublin Core): The inside part of a dirigible
Subject (Dublin Core): en Technology; en Airplanes and Zeppelins
Article Title and/or Image Caption (Dublin Core): In the Belly of a Dirigible
extracted text (Extract Text): THe end of a tunnel? No; the end of a dirigible as seen
from the inside. The shining spot in the distance is
the mouth through which the dirigible breathes.

The huge bag is filled with hydrogen gas. As it rises
in the air the pressure decreases and the gas tries to expand.
But this would stretch the casing. So the mouth—a valve
invented by a man named Gammeter—opens automatical-
ly and exhales until the pressure within is normal, where-
upon it shuts again.

When the dirigible comes down the reverse is true.
The pressure increases without and the bag tends to cave
in. Balloonets—small balloons inside the dirigible—are
used to keep the pressure constant on the way down. As
the hydrogen contracts the balloonets are expanded.
Contributor (Dublin Core): B. F. Goodrich Rubber Co. (Image copyright)
Language (Dublin Core): eng
Temporal Coverage (Dublin Core): Interwar period
Date Issued (Dublin Core): 1919-07
Is Part Of (Dublin Core): Popular Science Monthly, v. 95, n. 1, 1919
pages (Bibliographic Ontology): 62
Rights (Dublin Core): Public domain (Google digitized)
Source (Dublin Core): Google Books
Archived by (Dublin Core): Davide Donà; Marco Bortolami (editor)