抄録
The possibility of measuring the roughness of metal surface by means of electrical capacitance with vinyl sheat as insulator has been confirmed. This method is considered available in practise, for the roughness H from 6 to 200 micron can be measured in a few seconds. By this method the mean space between a specimen and a metal plate is measured which gives the 3-dimensional roughness. The relation between the 3-dimensional and the 2-dimensional roughnesses regarding, for example, the maximum height H or the root mean square (rms), is discussed.
