In a campaign or a travel quite often there is a need for determination of distance to inaccessible objects, calculation of the remained way and measurement of width of the river. That to measure it, to plunge optional into water and to cross the river, it is possible to carry out this task, being guided by rules of geometry.
Instruction
1. Find a river look on opposite I protect what-nibud the subject which is located at the course: bush, tree, stone or stub. Get up perpendicular to a current opposite to this subject. On the place where you got up, hammer a peg or insert a branch into the earth. Now move along the course until between you and the subject chosen on the opposite coast the corner equal 45 ° is not formed.
2. To measure a corner, use a compass or the watch. Get up so that the line going from 9 by 3 o'clock was parallel to a current, and the line going from the center of the dial by 11 o'clock made 45 °. The distance passed by you from a peg is equal to river width.
3. Also it is possible to determine river width by means of a blade. Break a blade. Choose two objects on the opposite coast and get up to them the person. Extend hands with a blade forward and with its help measure distance between objects, looking at them one eye. Then fold a blade double and slowly you depart from the river bank.
4. Stop when the blade put in half does not close distance between objects. Insert a branch in this place, measure the distance passed by you from the river bank to a branch and transfer it to meters. Received distance which is equal to river width.
5. It is possible to use the special pin device for measurement of width of the river. For its production take a plate and hammer into it pins so that they formed an isosceles rectangular triangle.
6. For carrying out measurement on the opposite river bank choose some subject. Get up to the coast perpendicularly, having drawn mentally a line, through the chosen subject. Move along the river bank, so far an object and two pins will not appear on one straight line. That distance which you passed is equal to river width.