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The astrolabe is an example of an inclinometer that was used for celestial navigation and location of astronomical objects from ancient times to the Renaissance. A tilt sensor can measure the tilting in often two axes of a reference plane in two axes. In contrast, a full motion would use at least three axes and often additional sensors.
The split bubble works by displaying half of both ends of the bubble side by side in the telescope, and when the curved ends are aligned it is level. An automatic level , self-levelling level , or builder's auto level includes an internal compensator mechanism (a swinging prism ) that, when set close to level, automatically removes any ...
If the bubble housing has graduated divisions, then the sensitivity is the angle or gradient change that moves the bubble by one of these divisions. 2 mm (0.079 in) is the usual spacing for graduations; on a surveyor's level, the bubble will move 2 mm (0.079 in) when the vial is tilted about 0.005 degree.
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By using trigonometry the user of an Abney level can determine height, volume, and grade. [3] Abney levels are made with square tubular bodies so that they may also be used to directly measure the slopes of plane surfaces by simply placing the body of the level on the surface, adjusting the level, and then reading the angle off of the scale.
The basic principle in these games is simple -- match three or more of the same bubble by shooting new ones from the bottom of the screen to the rows towards the top.
Students of figure drawing will also make use of a plumb line to find the vertical axis through the center of gravity of their subject and lay it down on paper as a point of reference. The device used may be purpose-made plumb lines, or simply makeshift devices made from a piece of string and a weighted object, such as a metal washer.