Assertion: radio telescope's reflector | /r/CapableOf | use tilted mirrors
Facets:
value: to avoid the secondary mirror
type: PURPOSE
Source sentences:
text: An unusual variant of the Cassegrain is the Schiefspiegler telescope ("skewed" or "oblique reflector", also known as "kutter telescope" after its inventor Anton Kutter) which uses tilted mirrors to avoid the secondary mirror casting a shadow on the primary.