Assertion: telescope's instrument | /r/CapableOf | add mirror
Facets:
value: to form a coudé train
type: PURPOSE
value: to the light path
type: TRANSITIVE-OBJECT
Source sentences:
text: Such instruments could not withstand being moved, and adding mirrors to the light path to form a coudé train, diverting the light to a fixed position to such an instrument housed on or below the observing floor (and usually built as an unmoving integral part of the observatory building) was the only option.