STADIA
Objective
-setup the level
-reading of upper,middle,lower
cross-hair
-using of stadia constant
-error of measurement
INSTRUMENT
 |
TELESCOPE |
 |
TELESCOPE STAND |
 |
STAFF ROD |
 |
TAPE |
 |
BUBBLE STAFF |
STADIA
 |
1.Set up the instrument and level . |
 |
2.Reading of upper,middle,lower cross-hair . |
 |
3.Measure the distance between telescope to staff rod . |
 |
4.Calculate error of measurement using stadia constant . |
| Upper cross-hair |
1.568 |
| Middle cross-hair |
1.513 |
| Lower cross-hair |
1.458 |
Distance (stadia) = (Upper cross-hair -Lower cross-hair) x 100 = 11
Distance (tape) = 10.99
Error of Work = 11 - 10.99 = 0.01
Error of Closure (Field work) = 1 : 1099
Error of Closure (Allowable) = 1 : 5000
Not accept this work because it's many error than allowable error .
