SU22904A1 - Dendrometer - Google Patents

Description

The proposed dendrometer refers to the number of instruments assigned for determination by sighting and on the basis of the properties of similar triangle-sized tree at the root and consisting of three triangle-forming rods, of which one, equipped with a weight, replaces a plumb. In the proposed dendrometer, this weight is made adjustable with the aim of imparting to the said plumb-rod inclined positions corresponding to the inclination of the trunk of the measured tree.

The dendrometer shown in the drawing in a side view consists of a hinge 6 of rods 1 and 5 and a rod 14 (all three with divisions) connected to it, suspended on the hinge of the clamp 20, movable along the rod 1 and provided with a load adjustable at the bottom by screw 21 19. The rod 1 at its other end is connected by a screw 15 with a sleeve 13 rotatable on the axis 2, adapted for fitting on any pole or tripod. Thus, the rod 1 can be rotated in the horizontal and vertical planes. In part 17 of the rod 5 there is a frame 7, movable with the help of a micrometer screw 8, in the direction perpendicular to the plane of the rods 1 and 5. This frame is equipped with a shield with an opening 9 for the eye, two diopter 10 are arranged on the rod 5: and 11 — moving through it with the help of a housezick.

The movements of the frame 7 are transmitted, by means of a rack and gear 18, to the disk 16 for a more noticeable reference. The rods 1 and 5 are rotated relative to each other by a screw 12, passed through the first one and resting against the part 17 of the second rod 5.

The device operates as follows: placing it at some distance from the measured tree, equal to approximately Ц of its height, is determined by sighting, through hole 9 and diopters 10 and 11, the ends vertically and horizontally placed on the rails of a known length - the ratio between the size of the tree and the scale divisions on the rods, as well as on the disk 16. In accordance with the ratio found, the rods 5 and 1 are moved apart and mounted on the known divisions of the mobile diopter Neither rod 14 with a load of 19, with the latter screwed over screw 21 so that when

free hanging, the inclination of the rod 14 was the same as the trunk of the measured tree. The rods 5, 14, and 1 of the device thus installed form a triangle, similar to that whose vertices are the point of the device's stand (more precisely, the center of the hinge 6), the beginning of the tree trunk and its diameter measured at a known height h from the ground. Based on the similarity of these triangles, the height of this diameter from the ground and the distance to it from the instrument are determined, while the dimensions of the diameters themselves are determined from the difference in the tangents of the angles obtained when viewing at the left and. right ends of the diameter and counted on the disk 16.

The subject matter of the invention.

A dendrometer consisting of three triangle-forming rods, one of which replaces the plumb bob, is provided with a weight, characterized in that the weight is made adjustable in a screw direction transverse to said rod 14 in order to impart inclined positions with respect to the rod 1.