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In surveying, a gyrotheodolite (also: surveying gyro) is an instrument composed of a gyrocompass mounted to a theodolite. It is used to determine the orientation of true north . It is the main instrument for orientation in mine surveying [ 1 ] and in tunnel engineering, where astronomical star sights are not visible and GPS does not work.
A theodolite (/ θ i ˈ ɒ d ə ˌ l aɪ t /) [1] is a precision optical instrument for measuring angles between designated visible points in the horizontal and vertical planes. The traditional use has been for land surveying , but it is also used extensively for building and infrastructure construction , and some specialized applications such ...
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Available online:PDF According to this, the ASC-15 and the ST-90 were used in the active guidance system, while the ST-124 was part of the passenger system. "Saturn V Flight Manual SA-507." A 244-page description of Saturn-Apollo 507, dated 5 October 1969. Includes a chapter about the instrument unit (Section VII, PDF page 149). Available on ...
Apollo Saturn V ST-124 Gyro on display at Huntsville AL Space museum The ST-124-M3 inertial platform was a device for measuring acceleration and attitude of the Saturn V launch vehicle. It was carried by the Saturn V Instrument Unit , a 3-foot-high (0.91 m), 22-foot-diameter (6.7 m) section of the Saturn V that fit between the third stage (S ...
The fundamental lines or axis of a transit theodolite include the following:- Vertical axis; Axis of plate levels; Axis of telescope; Line of collimation; Horizontal axis; Axis of altitude bubble and the vernier should read zero. These adjustments once made last for a long time. These are important for accuracy of observations taken from the ...
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Gimbal lock can occur in gimbal systems with two degrees of freedom such as a theodolite with rotations about an azimuth (horizontal angle) and elevation (vertical angle). These two-dimensional systems can gimbal lock at zenith and nadir , because at those points azimuth is not well-defined, and rotation in the azimuth direction does not change ...