Translation of: Ebene Blechwandträger mit sehr dünnem Stegblech.
Reprinted from "Zeitschrift für Flugtechnik und Motorluftschiffahrt, volume 20 ..., 1929, Verlag von R. Oldenbourg, München-Berlin."
Contents:
pt. 1. General theories and assumptions -- pt. 2. Sheet metal girders with spars resistant to bending. Oblique uprights. Stiffness -- pt. 3. Sheet metal girders with spars resistant to bending. The stress in uprights. Diagonal tension fields