AccuLine Pro 40-6910 Instruction Manual - Page 11

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7/29/09

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Page 11

5.7 Stadia Distance Measuring

Distance measuring can be done using the stadia hairs of the reticle.

The distance between the upper stadia hair and the lower stadia hair is

set at a 1:100 ration. So if the difference is 1 foot, the person holding

the grade rod is 100 feet away from the instrument.

5.8 Measuring Horizontal Angles

To measure or lay out an angle, set the instrument over a point and

level it up. Use a plumb bob with about six feet of string. Attach the

plumb bob string to the hook under the instrument by means of a large

loop fastened by a slipknot and adjust the plumb bob until it is clear of

the ground point. By shifting the entire instrument, set the tripod

(keeping tripod head as level as possible by estimation) so that the

plumb bob appears to be over the ground point. Next, press the legs of

the tripod into the ground and lower the plumb bob until its point is

about one-quarter inch above the point on the ground. The final

centering of the instrument can be made by loosening (about one-half

turn) any two adjacent (not opposite) leveling screws and slowly

shifting the instrument until the plumb bob is directly over the point on

the ground. Then retighten the same two leveling screws you loosened

and re-level the instrument.

To measure horizontal angles, such as FIG (Fig. 8), center and level your