Boron nitride BN is formed when boron is burned either in air or in nitrogen, but can be obtained more readily by heating to redness in a platinum crucible a mixture of one part of anhydrous borax with two parts of dry ammonium chloride.
Bn a p.
(i) If from the other angular points B, C, D, E, perpendiculars BN, CP, DQ, ER, are drawn to the base MS (fig.
If BN, CP, DQ, FS, GT are the perpen diculars to AE from the angular points, the ordinates NB, PC,..
Between 1895 and 1906 they rose 15% bn the average among males of all ages, and as much as 30% among women and girl workers.
If bl, b2, ..., k J is the cycle of recurring quotients, then b n 2a1, b, bn_1, b 2 bn_2, b 3 = bn_3, &c.
Bn, from which n - n 1 I n b2b3.
3 bn con - a 2 -a3 -.
Determinant a1 - I a2 O -I o 0 u an bn O O - - o o -I a n, from which point of view continuants have been treated by W.