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- Innovations: Bubble Sextant
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Photograph
Navigator Albert Hegenberger facing rear and behind a semi-protective windscreen while making his celestial sightings.
Artifact
One of the first effective models of bubble sextant for aeronautical use.
Artifact
A maritime sextant with a special bubble attachement to the eyepiece to aid in establishing a horizon in aeronautical use, circa 1919.
Photograph
A navigator making sightings from the nose of a U.S. Navy Douglas PD-1.