TY - JOUR T1 - Note on Vacuum Grating Spectroscopy JF - Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character (1905-1934) VL - 98 IS - 689 SP - 114 EP - 123 PY - 1920/10/01/ UR - http://dx.doi.org/10.1098/rspa.1920.0057 M3 - doi:10.1098/rspa.1920.0057 AU - McLennan, J. ER -