surveying iii (topographic and geodetic surveys) - Modern Prepper

(8) Loosen the azimuth clamp (13), and swing the instrument around to the most convenientposition for observing the circular level. Turn the large illuminating mirror until the bubble can beclearly observed. Center the circular bubble by adjusting the foot screws (7).(9) Direct the telescope along the line of sight by means of the open sights on top of theinstrument. Lightly tighten the azimuth clamp (13), and turn the telescope eyepiece (1) until thecrosshairs of the reticule appear sharp and black. Obtain the proper focusing using the focusing knob(3), and test for parallax by moving your eye up and down before the eyepiece to ensure no movement ofthe crosshairs on the rod. If the crosshairs appear to move up and down on the rod, correct or eliminatethis movement by moving the objective lens in or out. Readjust the eyepiece if the crosshairs appearfuzzy, and note the reading obtained on the diopter scale. For subsequent readings, reset the eyepiece atits original focused position. Bring the vertical centerline of the reticule to the center of the leveling rodby means of the azimuth tangent screw (12) located beside the azimuth clamp (13).(10) Observe the tubular level through the eyepiece (16), and turn the reflector until the images ofthe bubble ends stand out with uniform clearness. To obtain the most satisfactory illumination, ensurethat the white lacquered side of the reflector is uppermost and outwardly inclined. Turn the tilting screw(4), directly beneath the eyepiece, until the two half images of the level bubble form a single, continuouscurve. Note that the left and right halves of the level bubble image move in the same direction as the leftand right sides of the tilting knob (Figure 4-3, page 4-7 and the upper left side of Figure 4-4).Figure 4-4. Rod ReadingEN0593 4-8