1. Instructions
a. Hold the prism which is equipped with a strand – a strand with a right hand in a vertical position.
b. Yalon shadow left on the prism bottom prism, and shadow yalon that the right there at the top of the prism should connect straight and upright.
c. Make a sketch of the measurement in detail before being measured.
d. Make jobs report.
2. Equipment and Supplies
a. Yalon and stilt
b. Prism
c. Measure tape
d. Notebook
3. Safety
a. Prisms should be retained, should not be placed haphazardly.
b. In the distance measurement, the measuring tape is pulled flat as possible.
c. Wear work clothes, shoes, and hats field.
d. Return all equipment, clean and complete.
4. Work Steps
a. Determine the point boundary area to be measured, and the area in the sketch pad.
b. Place yalon at border points P1, P2, P3, P4, P5, P6.
c. Determine the divider point PQ with yalon as guidelines for the determination of a straight line of work.
d. Hold the prism and projecting all points starting from point P1, P2, P3 and so to measure line PQ.
e. And so on work carried out in the same way, so the point is projected toward the border of the measure line PQ.
f. Measure all distances P1, P2, P3, and so on to the line of measurement is the distance of the abscissa (X), ukurkan distance of the point of projection towards one another in a line of measurement is the distance the ordinate (Y) and all data should be recorded in the logbook.
g. For the calculation of the area that has been measured by summing the area of a trapezoid shapes and triangles.
h. Measurement is complete and described the results of measurements with a certain scale.
Figure 31