Assertion: sextant's horizon mirror | /r/HasProperty | silvered
Facets:
value: half
type: DEGREE
value: fully
type: DEGREE
Source sentences:
text: This is not the advantage that it might seems, as the horizon mirror is fully silvered, that is to say, there is no plain glass half, the horizon being viewed directly rather than through a thickness of plain glass.
text: The horizon mirror is half silvered so that the horizon can be viewed through the clear section and the reflection of the celestial body can be viewed reflected in the silvered portion.