Photograph of a Concentric-ring infiltrometer located at the Wheatland Conservation Experiment station located at Cherokee, Oklahoma. The back of the photograph proclaims, "Concentric-ring infiltrometer used on Experiment Station at Cherokee, Oklahoma. It was developed by Maurice B. Cox, Agri. Eng., working in cooperation with Louis E. Derr and W. Elmo Baumann, Soil Scientists. The water level in the rings are maintained at equal depth with the float chambers from discarded automobile carburetors. The rate of infiltration is recorded by a reconnaissance type recording rain gage as the water for the inner ring is siphoned from the filled rain gage bucket. Under field operation the rain gage should be closed to prevent wind movement from affecting the record on the chart. The barrel on the stand at the left holds approximately 20 gallons of water for the outer ring supply."

Photograph of a Concentric-ring infiltrometer located at the Wheatland Conservation Experiment station located at Cherokee, Oklahoma. The back of the photograph proclaims, "Concentric-ring infiltrometer used on the Experiment station at Cherokee, Oklahoma. The rings are made of 14 gage iron. The strips are 8 inches wide. The diameter of the outer rings are 20 inches and that for the inner ring is 8 inches. An eight-inch center ring was used because the rain gage was standardized on an eight-inch top. A float chamber is placed in each of the center and inner rigns [sic] to maintain a uniform depth of water."