How to use the thumb side of the distance away

They don't measure distance, they measure the direction of the wind.

Thumb Distance Measurement Technique

The thumb measures the distance in turn with the left and right eyes, using the mathematical principle of similar triangles. When training, first find a series of objects with exact distances, then stretch out your arms, raise your thumb, first close your left eye to see the position of your fingers and the object, and then close your right eye to observe the position of your fingers and the object.

Based on this, the relationship between the actual distance and the position of the finger and the subject matter observed by the left and right eyes is determined. In actual use, the actual distance is judged by the relationship between the position of the finger and the subject matter observed by the left and right eyes respectively.

Tips. Straighten your arm forward and raise your thumb, close your left eye, your right eye, thumb, and target form a straight line, close your right eye, open your left eye, remember the point on the right side of the target with your left eye and thumb extending the straight line, visually measure the distance between that point and the target, and multiply by 10, which is the approximate distance you are to the target.

The arm is flattened, the gaze is about 120 denses between the fingertips and the horizontal line, look at the height of the target to estimate how many dense positions the line of sight passes through the top and bottom of the target, and multiply the target height by the target height (based on experience) is the target distance.

Translation distance The actual distance between the two eyes (about 10cm) = the actual distanceReach(i.e. the length of your arm).

Another: Suppose there is a tree n meters away from us, measure our distance to this tree:

1. Raise our right arm horizontally, make a fist with our right hand, and give a thumbs up.

2. Use your right eye (left eye closed) to overlap the left side of your thumb on a straight line with the tree.

3. If you don't move your right arm and thumb, close your right eye, and then use your left eye to observe the left side of your thumb, and you will find that this edge is some distance away from the right side of the tree.

4. Estimate this distance (this can also be measured), and count this distance to 10, which is the approximate distance we are from the lesson tree.

It is said that this "thumb ranging method", after being proficient and correctly mastered, within 1000m, the measurement result is within 1m.

The thumb refers to the first finger of the hand, and the thickest and shortest finger is the thumb, which helps us hold things. The thumbs up gesture is almost universally recognized as a message that is good, high, wonderful, everything is going well, very good, and so on.

Example: "Guangyun Shanghou": "Thumb, thumb also." ”

The second and sixth episode of "Water Margin": "Wu Song.

The four fingers of the right hand are caged, and the thumb is pressed to cover the heart. ”

The Legend of the Heroes of Children

The sixth time: "It turns out that Gongzi An is still sitting in that place, with two thumbs blocking the door of his ears, and those eight fingers holding his eyes to hide cats there!" ”

Wei Wei. The East, Part 4, Chapter 21: "With heartfelt admiration, he gave a thumbs up and said: 'Korean women, great good! Also say "thumbs up".

The fifteenth chapter of "The Biography of Children's Heroes": "Deng Jiugong.

He gave a thumbs up and said, 'High! Thumbs up, usually a sign of approval and admiration.

Thumb distance measurement"Distances are measured according to the rectangular trigonometric function. Here's how we measure our distance to the target:

1. Raise our right arm horizontally, make a fist with the right hand and stand up the thumb 2. Use the right eye (left eye closed) to overlap the left side of the thumb with the target in a straight line;

3. If the right arm and thumb do not move, close the right eye, and then observe the left side of the thumb with the left eye, you will find that the edge line is a distance away from the right side of the target;

4. Estimate this distance (this can also be measured), and the distance is 10, which is the approximate distance we are from the target.

Similar triangle principle ranging; Your arms plus thumbs can be seen as the sides of a triangle. In general ranging, the thumb and arm are perpendicular, that is, the two sides of a right triangle are known. At this point, you need a piece of data to measure the distance.

This data can be estimated by yourself or obtained using multiple ranging equations.

Visual distance method: A simple way to measure distance with your fingers and eyes.

Close one eye, the other eye and thumb and the distant target in a straight line, then do not move, open the other eye, open the other eye, open the thumb to another position, estimate the distance from the other position in the original target, and then multiply by ten, that is, the distance from you to the original target.

This is called the skip-and-eye distance method, where the arm is straightened and the thumb is raised. The right eye looks at the target point from the left side of the thumb, and the left eye looks at the other point from the right side of the thumb. The distance between two points multiplied by ten is approximately the distance you are from the target.

If you use the above method to measure the distance to a house, and the two points are separated by 4 rooms, and 1 room is estimated to be 4 meters, then you are 160 meters away from the house.

In fact, this is a military method of distance measurement, called arm length measurement distance.

Measure with an arm-length ruler.

People have a pair of arms, if you ask him: How long are your arms? He probably shook his head and said he hadn't measured it.

Actually, to put it mildly, an arm-length ruler is a pencil (or wooden strip) engraved with a stroke. However, when combined with the arm, it becomes a very flexible and convenient ranging "instrument".

The pencil is drawn according to one hundredth of the length of each person's arm (the distance from the eye to the thumb and the tiger's mouth), so it is called the arm length ruler. For example, if someone's arm length is 60 centimeters, then a division on the arm ruler is 6 millimeters. With an arm-length ruler, you can measure the distance with an arm-length ruler as long as you know the size of the target in advance.

So how is the distance calculated? As mentioned earlier, each division on the arm length ruler is one hundredth of the length of the arm, and if the height (or width) of the target occupies one division, it is also exactly one percent of the distance, accounting for two divisions, which is two percent. In this way, according to the principle that similar triangles form proportions, the distance:

Target height (interval) = 100 (arm length) The number of divisions (arm length ruler), you can get the formula for finding the distance:

Distance = Height (Interval) 100 points.

For example: measure an interval of the pole in front, about 5 reticles, we know that the interval between the poles is 50 meters, so the distance to the pole is:

50 meters 100 = 1000 meters.

If you don't know the width (or height) of an object, can you use an arm's length ruler to measure the distance? It's also possible, but you have to create a known distance condition before you can calculate the desired distance.

When you observe the division of various objects with an arm-length ruler, you will find that the interval (or height 0) of an object is observed, the closer you are to the object, the more divisions are measured; Conversely, the farther away from the object, the fewer divisions are measured. According to this situation, we can measure the size and division of the same target at the front and rear positions, and measure the distance between the two observation positions before and after, with these three known numbers, we can calculate the distance according to the following formula.

Distance = Forward (or Backward) Distance Divide.

Major-small.

For example, in order to complete the task of building a bridge, a certain engineering unit first sent a scout to measure the width of the river, and this scout first measured the distance between the two objects on the other side of the river by eight divisions with an arm-length ruler, and then measured the separation between the two objects at a distance of 30 meters. Substituting these values into the formula, the river width is calculated as:

30 5 = 50 meters.

With your thumb, straighten out the position where you want to be, then open your left eye with your right eye and open your left eye, keep your thumb moving, and see that the approximate distance between the two thumbs is multiplied by 2

That's it!

Trouble, thanks!