Assertion: bris sextant | /r/HasProperty | fixed angle instrument
Facets:
Source sentences:
text: The two big differences between this simple device and those other more flexible instruments is that the Bris sextant is a fixed angle instrument and also, because the reflecting surfaces are not opaque, it can have more than two reflecting elements (three in the original design).24.148.18.151 (talk) 05:32, 25 October 2010 (UTC)