The action produced by rock All over culverts, until recently undetermined, has been conclusively shown by investigations made by the engineering experiment station of @ western agricultural college, There has been a feeling among engineers that fills sing material taken from solid rock excavation "arch over" a culvert and the full theoretical load is not effective on the structure. Results of the investigations have been conclusive proof that such fills act in manner analogous to an earth fill, and Produce loads in accordance with the previously accepted engineering theory and formula applied to finer materials, Deseription of the experiments and their results is now available in bulletin form.
Text read from the printed page and cleaned; old type leaves the occasional error.