دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a device containing an angle indicator, a timing element, and a replaceable chart that is used to measure the direction and the degree of deviation as a hole is being drilled. The timing element goes off when the tool has come to rest just above the drill bit and descends on the sharply pointed angle indicator, which then punches a hole in the chart. The chart rotates 180., and a second hole is punched to verify a correct reading of the resting angle of the tool.

n: a kind of mechanical inclinometer