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.
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.