Abstract: A slow-burning log is made of a solid-fuel material of a vegetable origin, the log having upper, lower and side surfaces, upper and lower vertical incisions, which are made opened on the side surface, and which extend from the upper and lower surfaces respectively, towards the opposite surface without reaching it, wherein the lower vertical incisions are not coupled between each other and uniformly alternate with the upper vertical incisions, characterized in that the upper vertical incisions couple between each other inside the log body thereby forming a middle hole, in addition, the ends of the lower vertical incisions are higher than the ends of the upper vertical incisions, and the upper and lower vertical incisions are provided in an amount of not less than three respectively.

Abstract: The invention relates to warming, heating, lighting devices, which represent a source of long-term stand-alone fire that can be utilized for using in fireplaces; in the field, in campings and in rest outside the city, in any touristic or other events. A slow-burning log is made of a solid-fuel material of a vegetable origin, the log having front, rear and side surfaces, through incisions, which are opened at the top of the side surface and which extend from the front surface to the rear one and, when penetrating into the log body, move apart at an angle with respect to each other and terminate in the log body.

Abstract: The invention relates to warming, heating devices for warming and cooking, and it can be utilized in household, in the field, in camping and in any touristic events as a source of stand-alone flame for warming, cooking, as well as for illumination. A slow-burning log that is made of a solid-fuel material of a vegetable origin has upper, lower and side surfaces, at least two vertical through incisions that extend from the upper surface to the lower one and intersect with each other thereby forming a general through vertical hole that begins in a midsection of the upper surface. The vertical through incisions are made as partially inner incisions, and beginning from the upper surface they do not extend to the side surface of the log, while in the lower section of the log they extend to the side surface thereby forming side entrances for air delivery on the side surface.

Abstract: Use: for warming, cooking and lighting at rest outdoors, in campings, in any field, touristic or other events. Essence: a slow-burning log made of a solid-fuel material of a vegetable origin, the log having upper, lower and side surfaces, upper and lower vertical incisions, which are made opened on the side surface, and which extend from the upper and lower surfaces respectively towards the opposite surface without reaching it, wherein the lower vertical incisions are not coupled between each other and uniformly alternate with the upper vertical incisions, the upper vertical incisions couple between each other inside the log body thereby forming a middle hole, in addition, the ends of the lower vertical incisions are higher than the ends of the upper vertical incisions, and the upper and lower vertical incisions are provided in an amount of not less than three respectively.