1. Instructions
a. Note the location of the measurement, perhaps there are objects – objects or dangerous animals.
b. Careful – careful in using yalon, so really – really upright
c. Careful careful in using penta prism, try yalon shadow of the left and right of the right – right upright
2. Equipment and Supplies Used
a. Yalon (at least 3 pieces)
b. Penta prism, mirror angles
c. Stakes bamboo / wood while (at least 2 pieces)
d. Measuring tape / meter (minimum 15 m)
e. Writing pad, writing tools, paper to sketch / note.
3. Safety
a. When carrying yalon, draped, front blunt, and should not be dragged yalon
b. Currently, the practice is prohibited kidding.
c. Be careful when plugging yalon to the ground.
d. After completion of the practice, the equipment must be cleaned again.
Method I:
Make a right angle in the field, with a penta prism. The arrangement consists of a prism top and bottom, to the shadow yalon top right, bottom left yalon to shadow, and the central part of which is a translucent glass as a viewfinder window. Shadows are seen in this prism must be fused / upright, from the bottom, middle and top.
Step keja:
1. People to I stick yalon at points A and B are completely upright
2. People II plug yalon C which will be projected onto the line A – B
3. People to I bring penta prism equipped strand – strand moves towards the left or right on the line A-B will measure plugged dititik C ‘(the projection of point C)
4. What if the shadow yalon that dititik A and point B on the penta prism held by people I had been upright, then the projection of a strand – a strand on the prism carried by the Brazilians I had was the locus point C ‘is sought. (poyeksi point C to the line A – B).
Method II:
Using corner mirrors, which in principle as in the first way, rationale used in this tool is the theory of the reflection of light that falls on the mirror inside the box. Rays coming from yalon towards the plane mirror, reflected such that the angle formed by the incident light and the normal line is as large as the reflection angle of the beam to the normal line. The angle that occurs from the reflection of the rays is 90 ° (elbows).
Work Steps Using Mirror Angle
a. Prepare the mirror angle and attach plummet.
b. Place yalon at points A, B, and C with a vertical upright position.
c. Walk in the direction of the line AB with a mirror angle.
d. Enter the shadow yalon A and B into the mirror angle.
e. When the shadow yalon A and B have entered into a mirror angle, then shot toward yalon C.
f. When the image is shot yalon yalon AB and C in the mirror already connect upright, the point at which the plummet is located (C1) is a projection point yalon, so yalon CC1 perpendicular yalon AB.