TY - JOUR T1 - Double Refraction and Crystalline Structure of Silica Glass JF - Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character (1905-1934) VL - 98 IS - 692 SP - 284 EP - 296 PY - 1921/01/03/ UR - http://dx.doi.org/10.1098/rspa.1921.0003 M3 - doi:10.1098/rspa.1921.0003 AU - Rayleigh, L. ER -