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.
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.