rings and brushes

rings and brushes

[¦riŋz ən ′brəsh·əz]
(optics)
An interference pattern produced by ordinary and extraordinary rays when a uniaxial crystal is placed between two polarizers.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The entire purchase of new-design and replacement components cost about the same as what it would have cost to order the original carbon slip rings and brushes from the overseas manufacturer, plus spares.