If in a campaign, on fishing or on vacation you appeared before need to learn river width, then do not try to throw through it a long rope. You will be helped by knowledge of fundamentals of geometry.
It is required to you
- Piece of a rope
Instruction
1. Here one of ways to learn river width without special measuring devices. Get up on the river bank at the line of water. Turn facing the distant coast. Now the point in which you settle down will be called A. Uchtite's point that for measurements you have to have a certain space for maneuver behind the back.
2. On the opposite coast you need to choose couple of well visible objects or objects. It can be perceptible high trees, stones, artificial constructions. Let's call them points In and S. Teper pick up a blade or a piece of a string. You hold a string for the ends to hands, having arranged it parallel to the earth.
3. Close the stretched string distance between the objects chosen by you on the previous step. Now put a string in half and gradually recede from a point And back until a half of a string does not close distance from In to With completely. You appeared in D. Rasstoyaniye's point from it to a point And where you were in the beginning of measurements, will be equal to river width.
4. Other way also assumes existence on the opposite river bank of well visible subject. The branchy or high tree, a stone, the building, a tower, a power line support, etc. will approach. We will call this object V. Vstante's point on the bank of just opposite to the chosen subject. You stand in a point And.
5. From a point And take along the coast not less than fifteen steps at right angle. In this place thrust a peg or a branch. Received a point of the Lake. From it in the same direction measure as much steps. Note a branch this point of Page.
6. From the received point With go away from the coast at an angle of 90 degrees to the EXPERT line to a point which will be on one straight line with In and O. Eto D.A point width of the river will be equal to distance from a point With to point. As you can see, everything extremely simply, available and does not demand the expensive measuring equipment.