characteristic of wiper performance results obtained above 15 cm oil are most significant as representing oil absorbed within the fibers which will be retained and is an important measure of wiper performance oil residue removal was determined by applying several drops of blandol white mineral oil including 0 5 dupont oil red to a lucite bar 18 inches by 2 9 16 inches by 3 4 inch fitted with a 4 inch by 2 9 16 inch top slide using a roller the oil was spread until evenly distributed the 21 2 inch by 8 inch sample was wrapped about the slide and a 0 4 lb in 2 weight placed on top the sample and slide were pulled across the bar at a uniform rate and the oil remaining on the bar washed off with mineral spirits into a 600 ml beaker the residue was then transferred quantitively into a 50 ml volumetric flask and the volume adjusted to 50 ml with mineral spirits the flask was then placed in a colorimeter absorption cell and the percent transmittance measured at a wavelength of 5250 a u00b0 the amount of oil residue was obtained from a calibration curve derived from tests run using known oil weights the procedure was repeated five times and an average taken water residue results were obtained using a lucite slide 3 2 inches wide by 4 inches in length with a notched bottom adapted to receive a sample and slide along a 2 inch wide glass plate of 17 8 inches length in carrying out the test a 2 5 inch by 8 inch.