Assertion: mirror's zone | /r/HasProperty | long
Facets:
value: at auto-collimation test
type: LOCATION
value: at the telescope
type: LOCATION
Source sentences:
text: At the radius of curvature, a band that is too flat means that the zone is long ('too flat = long' rule).
text: At the telescope (or auto-collimation test), if the the bands bow outward when the grating is outside or above focus, the zone is long ('out-out = long' rule).
text: At the telescope (or auto-collimation test), if the the bands bow inward when the grating is inside or below focus, the zone is long ('in-in = long' rule).
text: Combining these rules at the telescope, when the band bends towards the grating, the grating's position with respect to focus tells us when the zone is short or long; when the band bends opposite the grating's position, the zone is opposite the grating's position vis-a-vis focus.