TY - JOUR T1 - On a New Method of Spectrum Observation JF - Proceedings of the Royal Society of London (1854-1905) VL - 30 SP - 22 EP - 31 PY - 1879/01/01/ UR - http://dx.doi.org/10.1098/rspl.1879.0079 M3 - doi:10.1098/rspl.1879.0079 AU - Lockyer, J. ER -