کلمه gyroscopic surveying instrument یافت شد:
n: a device used to detem1ine direction and angle at which a wellbore is drifting off the vertical. Unlike magnetic surveying instruments, a gyroscopic instrument reads true direction and is not affected by magnetic irregularities that may be caused by casing or other ferrous metals. See directional drilling, directional survey.
n: a kind of inclinometer used to measure the angle of inclination ,angle of orientation using the orientation-keeping ability of the top
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