the dielectric layer or layers in a ceramic capacitor having at least one buried electrode is deposited by a curtain coating process that includes obtaining a measure of the ceramic - paint - curtain thickness . a source of electromagnetic radiation , e . g . in the infrared range , is directed equally near the left and right edges of the curtain , and detectors at the opposite curtain surface side pick up the difference in the radiation transmissivity which is a measure of curtain thickness assymetry left to right . by adjusting the paint reservoir from which the curtain issues to make the difference zero and the curtain symmetrical , uniformity in paint coating thickness is achieved .