...strains. We will call here the connexionpoints 0, 1, 2, 3, &c., and the bars will be represented by two figures (01), (12), &c. ; the lengths of the bars we call r with the respective figures, rlg, &c., and the strains likewise, Si3, &c. We take now nI3=«, 8 and find further : 17 = i« i*'....