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ESTIMATION , TRITIYA SOPAN LOG BOOK, THE BHARAT SCOUTS AND GUIDES

Estimation is "accurate guessing". As scouts go about they should hold contests in guessing the heights of tree, church or temple and verify by scouts staff checking as to who was nearest. This will give them good training contest in guessing the distance of the nearest till to other land marks and pacing it off to check the distance is also good training. Scouts should frequently indulge in self-imposed exercise of this kind if they are to become good at "Estimation".

HOW TO FIND OUT THE HEIGHT OF A TREE

Estimation is different from measuring. The method given below come under measuring. Several methods are available for measuring the height of a tree. These can be used with equal accuracy for the measuring heights of Towers, Tall Pillars and Gopurams.

Inch to Foot Methods:

From the foot of tree X and moving in a straight line measure 11 units and mark the spot. Next measure one more unit and mark the spot. Let the first spot be A and the second spot be B. At a plant a Scout staff vertically, now lie down the ground and with your eye at B Sight the top of the tree. Ask another scouts to help you mark the spot on the staff where your sighting line cuts it call it, C. The height of AC in inches equals that of the tree in feet. One inch on the staff is equal to one foot on the tree.

Shadow Methods :

This consists in comparing the length of the shadow of the tree with the length of the shadow of an object of known height.

HOW TO FIND OUT THE WIDTH OF A RIVER

I. Methods of Similar Triangles/Rivers methods :

A is a position where you are standing. On one bank of the river X is an object on other side of the river bank. Take 6 to 10 more stick steps on any side say towards C (Imaginary point). Halt at B i.e. middle of the A-C. At B, put one stick or a Scout/Guide may stand. Walk upto Ci.e. equal steps of A to B. For Example if you have walked 10 steps from A to B, then walk 10 more steps from B towards C. From C, walk on opposite direction upto the place where you will find B and X in same line. Mark that point as D. Distance from C to D is the Distance/Width of the River i.e, AX.

Compass Method:

A good compass like the silva compass or a prismatic compass will be be of use in determining the width of a river. As before select a tree on the opposite bank. Let us call it X. Next select a point A on the near bank exactly opposite the tree X Drive a stake at point A. Standing at A take the bearing of the tree. Let us say it is 20°. Now add 45° to it. This given 65°. Let his spot be B. The distance from A to B is equal to the width of the river.

At A the bearing is 20°

At B the bearing 65°

AB=width of the river.

Judging Numbers :

This is another ability that Scouts should cultivate. It may be necessary to judge the number of people in the crowed or sheep in a flock or cattle in a herd. For practiceÊ»guess' at a glance the number in a small section of the crowd or flock or herd then check by actual count. When you can estimate in this way you can go one step further, practice in relations to the whole crowd or flock or herd. The system can be used to estimate quickly the number of people at an entertainment or hockey or football game. This however is not a requirement for the Test. 

Judging Distance by Sound : 

Distance can be judged by signal and sound. If you see a gun fired, for instance and count the number of seconds that elapse between the flash and the report you can tell how far the sound came from, if you remember that sound travels at 365 yards (337m) in a second. During a thunder and lightning storm you may be able to quieten nervous people by pointing out to them between the flash and the roll of the thunder show that the phenomenon was taking place kilometeres away. Methods given wider "How to find the height of a tree" and "How to find the width of a river" are really methods of Checking, They are based on the theorems in geometry and are accure, if accurately performed, It is to be clearly understood that estimation is guesssing accurately. The accuracy of it is gained by experience.

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