There are situations when it is required to determine the linear sizes of an object, for example, river width. The difficulty in this case is that ordinary measuring tools here obviously do not approach. How to be in similar cases?
Instruction
1. Way first. To measure river width, it is necessary to rise, first of all, ashore directly at the line of water facing the opposite coast. Let's call a point to which you are a point And. Behind the back of you has to be rather free space.
2. Choose two well seen objects B and Page on the opposite river bank. Pick up a small subject (branch, a blade, etc.). You hold a branch with both hands for the ends, having arranged it parallel to the Earth's surface.
3. Looking one eye, close a branch distance between two chosen objects on the opposite coast. After that put a blade in half (break off a branch on two equal parts) and recede from the coast back until a half of your branch (blade) is not closed by it completely. The distance from a point in which you are now (a point E) to a point ashore, in which you were before, just and will equal to river width.
4. To determine river width in the second way, get up on the river coast in a point opposite to well visible subject. A natural object (tree, the rock) or an object artificial (a haystack, the building, etc.) can be this subject. We will call a starting point a point And, and opposite, on other coast, the object chosen by you will be a point of Century.
5. Now it is necessary for you from a point And to make at right angle along the coast several dozen steps, not less than twenty. Thrust in this place to the earth some visible tag (a branch, etc.). Let's call this point a point of the Lake. From a point About in the same direction count exactly the same number of steps. Received the Page point.
6. Now go from a point With away from the river bank at right angle to the EXPERT line to the next point D which will lie on one straight line with points In and O. Shirina of the river will equal to distance between points With and.
7. Advantages of the ways of measurement of width of the river given above is that they practically do not demand existence of any special measuring tools. You can quite manage make-shifts.