Successful application of revibration in the construction of tankers and cargo ship during World War II has been described a number of times and this same procedure has also been satisfactorily used on some dry docks and piers where water tightness was considered essential. Additional evidence has accumulated which confirms these results and indicates that revibration will improve many of the qualities of hardened concrete. Increased consolidation is desirable where greater water tightness, improved appearance of formed surfaces, higher compressive strength, and greater density are considered to be desirable. The test also showed that revibration improves the appearance of concrete surfaces. Initial vibrating consolidated the concrete and removed many of the water and air voids appearing against the surface. After the vibrator was removed, water again began to collect in the voids remaining against the surface. Revibration 1 hour later removed some of the entrapped water and improved the appearance of the concrete. Additional revibration after 2 an d 3 hours improved the appearance of the concrete even more. Concrete will benefit from revibration at any time provided the concrete is sufficiently plastic to permit the running vibrator to sink of its own weight. If vibration is slighted during the rush and confusion that often occurs when concrete is placed, deficiencies can be corrected by revibration. After the trucks and concrete crews have moved on, the vibrator man can methodically revibrate the concrete without haste. Revibration thus provides additional insurance that the concrete will be properly consolidated and free of honeycomb.