Function of compass:
1. Measurement of rock stratum direction: Rock stratum direction is the direction of the intersection line between the rock stratum layer and the horizontal plane. When measuring, place the bottom edge of the long side of the compass close to the rock layer layer. , when the circular level bubble is in the center, read the north or the degree pointed by the compass (because the trend line is a straight line, its direction can extend to both sides, so you can read either the south or north needle).
2. Measurement of rock formation inclination: Rock formation inclination refers to the direction of the maximum downward inclination line of the rock formation (true inclination line) projected on the horizontal plane. When measuring, point the north end of the compass toward the downward sloping direction of the rock formation, and place the short edge of the south end against the rock formation. When the bubble of the circular level is in the center, read the degree pointed by the north needle. Measurement of rock formation inclination angle: The rock formation inclination angle refers to the maximum angle between the layer and the imaginary horizontal plane, which is called the true inclination angle.
3. The true inclination angle can be measured along the true inclination line of the layer. If the inclination angles measured along other inclination lines are smaller than the true inclination angle, it is called the apparent inclination angle. When measuring, stand the compass on its side so that the long side of the compass is close to the layer. Use the middle finger of your right hand to turn the adjustable wrench on the outside of the chassis and move the compass along the layer. When the bubble of the tubular level is in the center, the maximum degree pointed by the inclinometer pointer is the degree of the rock formation. What a dip.