Publisher's Synopsis
Excerpt from Aeronautic Instruments
Statoscopes are used more frequently in lighter-than - air craft than on airplanes. They provide a sensitive means of indicating qualitatively whether an aircraft is rising or falling and help the aviator to maintain horizontal ?ight. The ordinary type consists of a closed air chamber, which is connected to the exterior air through a glass U-tube containing a small quantity of colored liquid, thus forming a trap which seals the air in the container. Heat insulation is used to prevent the expansion and contraction of the confined air with changes of external temperature. When the aircraft rises or falls the pressure of the air inside the con tainer becomes greater or less than that of the external air, according as the aircraft is ascending or descending, and as a result the liquid in the trap, which is visible to the aviator, is forced in one direction or the other, indicating a change of level. When the difference in pressure becomes sufficiently great, equilibrium is reestablished by air being forced past the liquid in the trap, after which the liquid again collects in the trap as previously. The frequency with which the air is forced past the liquid or, as it is ordinarily expressed, the rate at which the bubble breaks is a rough measure of the rate of ascent or descent. Statoscopes can be made to detect changes in level of from 5 to 10 feet. A typical instrument is shown in Figure 4.
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