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The BNA nomenclature has been adopted in part, but by no means to the exclusion of the old terminology, which is certainly a far more efficient means of introducing an ultimate uniform nomenclature than an immediate complete change to the BNA system. The text is well printed and readable, and the proof reading in general good.
For the triangles ACB, BNA being rectangular and having the side AB common, and the side CB equal to NA, it follows that the angles opposite to these sides will be equal, and therefore also the angles CBA, NAB. But as CB, perpendicular to CA, marks the direction of the incident ray, so AN, perpendicular to the wave BN, marks the direction of the reflected ray; hence these rays are equally inclined to the plane AB.
The children also were very clever at showing their humility and good manners in the presence of the elders. Shaphang ba long U Siem Shillong. U Siem Shillong u long uwei u Siem uba khráw shibún bad uba don bór ruh ha kane ka ri lúm Khasi. Ia une u Siem la jiw bna baroh kawei ka ri ba u long u Siem-Blei.
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