It consists of a semiconductor plate with an angular gradient, a rectangular plate extending from a right angle of a semicircle plate to an upward direction, and a tabulation plate with a cylindrical cylindrical cylindrical cylindrical cylindrical cylindrical cylinder between two ends, and a cylindrical cylindrical cylindrical cylindrical cylindrical cylindrical cylindrical cylindrical cylindrical cylindrical cylindrical cylindrical cylindrical circular circular circular circular circular circular circular This is the opposite of the verticality of the semicircular and rectangular plates, and in the middle of the intersection of the two plates.Comprende una placa semicircular que presenta una escala graduada angular； una placa rectangular que se extiende perpendicularmente desde el lado recto de la placa semicircular； y un elemento guia tabular que tiene un pivote entre sus extremos, dispuesto a partir del pivote； donde dicho pivote se ubica opuesto a la perpendicularidad de la placa semicircular y rectangular y en medio de la interseccion de ambas placas.
