Assertion: sextant's error | /r/CapableOf | hold the sextant
Facets:
value: horizontally
type: MANNER
Source sentences:
text: So to check whether such error exists to bring the index arm to the middle of the arc with the help of quick-release clamp and holding the sextant horizontally, keep the arc away from you, look obliquely into the index mirror till the arc of the sextant and its reflection on the index mirror are seen simultaneously.