### Some formulæ for the calculation of wires. return loop system

Edwin R. Keller
1895 Journal of the Franklin Institute
Dec., x895. ] Formulae for the Calculation of Wires. 455 span p is smaller for H = 2 than for H = i. This seems at first sight absurd, but it is a consequence of our assumptions. The ice sheet with the wider span can, with the same curvature at the banks, better take advantage of the support of the water. And the thin sheet can bend down with a sharper curvature than the thicker ice; for the thinner it is, the less the' fiber strain for the same curvature. • A comparison of the two tables
more » ... he two tables reveals a radically different build of the formulas, as was to be expected, inasmuch as in the lake, the curvature is synclastic or anticlastic, in the canal cylindrical. .P, for the lake, is the weight distributed over a circular area of radius 2 feet ; for the canal it is the load per lineal foot acting over the whole length at the center of the canal. A comparison is, therefore, hardly possible ; even taken for a length of 4 feet, it is considerably less for the canal than for the lake, as should be expected. The uniformly distributed load, p, is, on the contrary, greater for the canal than for the lake; the ice can bend down more readily to be supported by the water. The ice here considered is pure, hard, glare ice. At temperatures above or a little below freezing point, its plasticity may make it yield to pressure and strains without becoming fractured. ELECTRICAL SECTION,