outer rollers each had diameter of 40 mm and a length of 10 mm whereas the inner roller had diameter of 40 mm and length of 5 mm the roughness of the rolling surface was reduced by finish cutting to a mean center line roughness of ra 0 05 u03bcm by cylindrical grinding table 1 shows the test conditions the procedure for the experiments was as follows the rotating speeds of all the rollers were increased to the predetermined ones in the meantime each entire roller was heated with infrared rays so that the temperatures of the feed oil and the surface of the rollers were in the predetermined temperature range apply the load decrease the speed of the inner roller and increase the speed of the outer rollers while maintaining the average speed of the two at a constant value to thereby provide the desired slip and continuously obtain the various values of the traction coefficient versus the slip ratio the traction coefficients obtained under the above conditions first linearly increased with the increase in the slip ratio then gradually leveled off at a peak and then decreased the practically important region lies in the region up near the peak of the curve where the heat generated by the shearing of the oil film is not large therefore the traction coefficient at slip ratio of 5 was chosen as the object the following components were added into a 4 necked flask 240 g of commercially available 1 2 4 trimethyl benzene and 20 g of industrial grade 92.