Calculation rule for the determination of weights and surfaces of commercial profiles of iron and other metals (Machine-translation by Google Translate, not legally binding)

摘要

A new calculation rule for the determination of weights and surfaces of commercial profiles of iron and other metals, comprising a substantially flat aluminum cassette, into which a rule with numerical indications slides, characterized essentially by the fact that in One of its faces, the aforementioned box carries a series of engravings that represent commercial profiles of iron in T, U or others, in dependence with windows located in its vicinity, of which, some correspond to the heights materialized by a geometric boundary, while others correspond to their weight, these values being found in the numerical indication of the sliding reglilla, and also characterized by the fact that on the opposite side there are, in a laterally limited column, the drawings of bar sections in relation to a window located in its upper part corresponding to the dimension of this section, while at the height of cad to one of the sections appear as many windows for the weights, having in the other side parallel graduations for lengths and thicknesses of plates or plates in dependence with parallel windows through which appear graduations that indicate the widths and weight. (Machine-translation by Google Translate, not legally binding)