this network is the most famous of all, it wears the name of the man who discovered it, the Dr Ernst Hartmann
, it was discovered at the beginning of the 1950s.
It is also known as global network
or universal network
because it covers the entire surface of the planet. This is a network considered as telluric
(coming from Earth).
Characteristics on neutral ground:
- fine bands oriented North-South and East-West 21 cm wide.
- The meshes formed by these tapes have the following dimensions:
- 2m in the North-South direction
- 2. 50 m in the East-West direction
- Some mesh can be distorted by electromagnetic interference.
This network (like many others) is vertical
, it is to say that you can found it under the Earth (in the mines
) and at very high altitude (on mountain
A representation of this network:
Before starting the researh, find two a minimum of 2 large meters in wood and a compass.
Watch on your list of values
, move the slider of the antenna on the 12.0 mark.
Place your compass on the ground and make it point to the North.
- Verify that the North of the compass is correct, in apartment is not uncommon that the reinforced concrete generates strong magnetic disturbance.
- We are in a school case, where the Hartmann network is parallel to the North and West, in reality, especially in a place inhabited / electrified /
furnished it is rare to find such a situation.
- In this research, we look for the Hartmann network at its ground-level (width and length axis). Caution, the network can also have different positions on the
Focus (mentally) on Hartmann network, a good question to keep in mind:
"Where is located the Hartmann network at ground level and at this exact moment."
Note on the question:
- It is important to specify the ground-level because the field can be located in another location at an other height.
- We also specify the time: at this exact moment, it is an important precision because in a house or apartment the position of the field may vary
depending on whether electricity is enabled or not. Enabling or disabling appliance (refrigerator, washing machine, TV, PC...) can also change the location of the
According to the network that you are looking for walk perpendicular to its theoretical orientation.
Walk gently side way taking the antenna in front of you (walk from right to left, like crabs). You can also walk among walls of the room where you are.
Here we will begin moving following the North-South axis.
When you will cross the Hartmann network your antenna will become heavier, which will make it fall forward (or backward, it can also thrill depending on your way to
Take a close enough fixed guide near you, like a chair, a tree, a pebble....
In order to be sure that you do not commit error, replay steps 3, 4 and 5 several times, but changing direction (right to left and left to right).
You should get a different result because the Hartmann network lines have a wide of 21 cm, you should therefore find the right side and the left side of the line.
Place one of your meter at the center of your two guides obtained earlier and on the ground. Use your compass (East-West or North-South according to your research axis)
in order to place your meter straight.
Replay steps 3, 4, 5, 6 but walking East-West.
This time, you can walk near the meter you already put on the ground.
You should obtain the following result:
Replay steps 3, 4, 5, 6, 7 in order to obtain a network, each crossing will form a node.
In the end, you should have something like this (in a school
- Are you sure that the location where you are standing is electromagnetically neutral. Indeed, if this is not the case, the compass gives you a false
information and in this case it is very possible that the network is deviate or cut, you may be right, try an another location.
- If you find that the spacing between your metres does not match the theoretical value (here 2.0 m North-South and 2 50 metres East-West), may be it is
because some home devices deform the network, however if you are in full field, this may come from an underground cable or simply the under floor cavity, rock,