Assertion: refracting telescope | /r/HasProperty | design
Facets:
value: at that time
type: TEMPORAL
Source sentences:
text: The reflecting telescope was invented in the 17th century, by Isaac Newton, as an alternative to the refracting telescope which, at that time, was a design that suffered from severe chromatic aberration.
text: The reflecting telescope was invented in the 17th century as an alternative to the refracting telescope which, at that time, was a design that suffered from severe chromatic aberration.