The Bubble Octant
From the early 1930s through the end of the 1950s, several types of civilian and military bubble octant instruments were produced for use aboard aircraft. All were fitted with an artificial horizon in the form of a bubble, which was centered to align the horizon for a navigator flying thousands of feet above the earth; some had recording features.
Read more about this topic: Octant (instrument)
Famous quotes containing the word bubble:
“No bubble is so iridescent or floats longer than that blown by the successful teacher.”
—Sir William Osler (1849–1919)