4.1. Hartmann Lines

The rays of the energy named after Ernst Hartmann run north-south and east-west, forming rectangles the size of which depends on the geographical position of the measured area. In Slovenia, for instance, the sides of a rectangle in the Hartmann grid are 2.8m long in the direction north-south, and 2m long in the direction east-west. The width of the lines is around 20cm. Some researchers use other values of the sides of the rectangles in the Hartmann grid. When cleaning an area this is not a problem, because in this case we only look for the points of harmful radiation, and the latter is always present at the meeting points of vertical and horizontal lines.