Reading Measurements Using A Leveling Rod; Height Reading; Distance Measurement; Calibration - Stanley AL24 Instruction Manual

2. Focus the telescope by locating a target, such as a leveling rod, using
the optical peep sight. Looking through the eyepiece, use the focusing
knob to bring the target into sharp focus. Center the vertical hair within
the target using the horizontal drive knobs on either side of the
instrument.

Reading measurements using a leveling rod

Height reading

Read the rod where it is intersected by the horizontal hair. For example, the
height reading in Fig. 4 is 1,195 m.

Distance measurement

Read the rod where it is intersected by the upper and lower stadia hairs; in
Fig. 4 these readings are at 1,352 m and 1,038 m. The stadia ratio is 1:100;
therefore, the distance from the instrument to the rod is: (1,352 – 1,038) x 100
= 31,41 m.
Angle measurement
As shown in Fig. 5, sight point A and rotate the horizontal circle until the
reference mark is on "0". Rotate the level and sight point B; the reference
mark will indicate the angle between A and B.

CALIBRATION

Your AL24 Automatic Level has been factory calibrated; however, you should
occasionally check your level for errors caused by shipment or rough
handling.
Compensator lock button
Check the compensator for proper operation before use or anytime the
operation of the instrument is in question. Push and release the compensator
lock button to shake the compensator. The compensator should return to the
exact horizontal position sighted before the lock button was pressed.
AL24 • 5