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Figure 2. <br />A cut-away section of inclinometer casing shows the two <br />sets of diametrically-opposed grooves. One pair of grooves <br />is aligned with the slope movement while the remaining <br />pair is aligned perpendicular to the slope movement. A <br />profile view of the various sizes of inclinometer casing is <br />shown behind the section (image courtesy of Durham Geo <br />Slope Indicator). <br />E <br />E <br />I <br />Once the inclinometer grout has set (after several days), the entity <br />responsible for monitoring the inclinometer will first take a "baseline" <br />reading, which will record the position of the inclinometer at discrete <br />points along its length. Typically, the measurements are taken at two- <br />foot intervals. <br />The inclinometer probe is a two-foot long narrow shaft with two sets of <br />wheels at each end that track along the grooves inside the casing. An <br />accelerometer mounted within the probe measures the tilt of the probe <br />(and hence casing) in the plane of the wheels at each measurement <br />interval, while a second accelerometer measures the tilt of the probe <br />perpendicular to the plane of the wheels. This is shown graphically in <br />Figure 3 below. From this data, the in-ground shape of the inclinometer <br />casing can be plotted. <br />Figure 3. <br />A cutaway view of the inclinometer probe traversing a section of <br />the inclinometer casing. The wheels lock into the grooves cut into <br />the casing. At each location where a measurement is taken, the <br />probe inclinations parallel and perpendicular to the plane of the <br />wheels are recorded digitally (image courtesy of Durham Geo <br />Slope Indicator). <br />Angle of t <br /> <br />-r-al <br />erval <br />GEOTECH! <br />Inclinometers Page 2 of 6