TY - JOUR T1 - On the Improvement of the Spectroscope JF - Proceedings of the Royal Society of London (1854-1905) VL - 22 SP - 308 EP - 310 PY - 1873/01/01/ UR - http://dx.doi.org/10.1098/rspl.1873.0051 M3 - doi:10.1098/rspl.1873.0051 AU - Grubb, T. ER -