Hartman Grids are horizontal grid systems and have “windows” of about 2 x 2.5m with a 20cm space between them. Intersections can be polarised positive, neutral or negative.
The Hartmann grid is an earth grid named after Dr Ernst Hartmann who it is thought was the first to observe earth grids. It is a worldwide grid in accordance with the earth’s magnetic field, i.e. approximately N/S, E/W.
There are considerable variations in the grid spacing dependent on local conditions and the degree of latitude. In Greenland a spacing of 1.05m x 1.20m is found. In England the average spacing is 1.60m x 1.68m while in the Canary Islands it is 2.00m x 2.50m. The straightness and orientation of the grid lines can be affected by building geometry, high voltage power lines and radio stations etc.
Hartman grid runs north to south, east to west and is associated with Moon energies.
(Source: British Dowsing, britishdowsing.net)