The theory and practice of modern framed structures : designed for the use of schools, and for engineers in professional practice (1897)
Johnson, J. B. (John Butler), 1850-1902, Bryan, C. W. (Charles Walter), 1863-1927, Turneaure, Frederick Eugene, 1886- · New York : J. Wiley & Sons · leaf 30
the load line. To cause equilibrium there must be a force R^,equal and opposite to R^ and applied in the line CD.Graphically then, for equilibrium of non-concurrentforces, the force polygon must close, giving equilib-rium of translation, and the last force must coincide ivith the last segment of… … Fig. 16. 14 MODERN FRAMED S7RUCTURES. segment; and if the system is a balanced one, it is as well the line of action of the resultantof all the forces upon eitlicr side of that segment. When the forces are parallel or nearly so,a special expedient is necessary to enable us to draw an equilibrium…
