Rule for calculating the strength of standardized profiles, characterized in that it consists of a movable central element or panel sliding inside a fixed guide cover, for which purpose it presents in the central parts of the ends of the guides two pairs of fixing plugs, the cover presents in the lower right corner of its two faces the drawing of a double profile T carrying seven windows in vertical and two others next to the profile advantageously arranged so that in the sliding of the strip appear in these last two windows the dimensions of the base and in the lower window and the thickness of the profile in the other corresponding to the normalized profile whose reference has been selected through the sixth window from top to bottom and because in the upper window will appear the data corresponding to beams of: distance between supports in meters, date resulting from the requests and admissible loads in tons and because in the following three windows will appear the data corresponding to supports being for the second positioned free buckling height in supports formed by a single profile I and admissible loads in tons and because in the window located in third place the data corresponding to supports are those of free height of buckling in pillars of 2 I, number of spaces between loops, capital and Basa and admissible loads in tons and because in the window of fourth place and third of the group of supports corresponds to distance between the vertical elements. (Machine-translation by Google Translate, not legally binding)
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