Show CONCRETE ROAD VIBRATIONS VIBRATIONS-d. Experiment Started to Determine Amount of Moisture Increase Under the Road Does vibration caused by the movement movement movement move move- ment of or a vehicle over a road Increase the amount of moisture in in the earth under the road and thus weaken its bearing power This question will be answered when results are secured folio oin an experiment Just started by bythe bythe bythe the bureau of public roads United States Department of ot Agriculture Two similar concrete slabs have hae been r ron ron- n- n side by side and on one there will be placed n a gasoline engine with an unbalanced flywheel wheel which will cause vibration Soil SoU samples will be betaken betaken betaken taken from under the time slabs and the tho amounts of or moisture compared This experiment is undertaken not with the thu Idea that road vibration can enn be prevented prevented prevented pre pre- vented but to determine whether sufficient sum clent Increase In the moisture of ot tho the is caused by it to weaken time the bearIng power of ot the soil and Incidentally incidentally inci Inci- dentally to develop new ways wn's of testing test test- In lug ing methods of treatment |