Discussion on "Recent developments in the measurement and control of surface roughness" at the Edinburgh Section of the Institution

MR. BENNET (Section President) : We have listened to an interesting lecture, and it is certainly news to me, and possibly to others here, that surface roughness can be measured to a millionth part of an inch. I am interested at the moment in a pair of steel rolls in a rolling mill, the rolls being about 12 in. diameter by 20 in. long. I should like to ask the lecturer if he has any knowledge of tests for surface roughness such as he has shown us being made on mill rolls.