New calculation rule for the determination of the characteristics of the air circulation by duct and and or shock absorbers. (Machine-translation by Google Translate, not legally binding)

摘要

New calculation rule for the determination of the characteristics of air circulation by ducts and/or dampers, which is essentially characterized by being of the type that have a basic rule, equipped with windows and regattas that run along all its length and a line or cursor capable of running inside the same, in which there are tables of numbers or scales that must appear through the windows and races that exist in the previous one and in the back of the base rule appearing on the front of this and on both sides of the brand name, name and distinctive identifier of the petitioner which occupies the upper central part of it, a double regatta or elongated window, vertically arranged under the designation allusive to two thicknesses of buffer layer and that will allow reading the degree of damping obtained respectively at distances of one and two meters in decibels, for the frequency s that are inscribed in figures vertically to the left of the first of these windows and that are given in hertz, completing the fire windows two small square windows, located on top of each pair of upper vertical windows in which the name appears on the left or subway symbol, the rest of the obverse of the base rule being covered by three scales, two of them arranged along it and separated each double scale of, its immediate bottom, by an intermediate race parallel to them, marking itself to the left of the obverse of said base rule the distinctive letter of the magnitude that measures each of the scales as well as the indication of the unit of measurement in which the figures of the same are expressed, the order of arrangement of said scales being that of the section in square meters and diameter in millimeters at the first double scale, the speed in meters per second for the first horizontal regatta, the volume e n cubic meters per second for the second double scale and the specific weight of the air in kilograms per cubic meter in the second horizontal regatta, here the mass air flow is in kilograms per hour in the simple lower scale. (Machine-translation by Google Translate, not legally binding)