TY - JOUR T1 - The Effect of Pressure upon Arc Spectra. No. 2. Copper, $\lambda $ 4000 to $\lambda $ 4600 JF - Philosophical Transactions of the Royal Society of London. Series A, Containing Papers of a Math. or Phys. Character (1896-1934) VL - 209 SP - 205 EP - 226 PY - 1909/01/01/ UR - http://dx.doi.org/10.1098/rsta.1909.0009 M3 - doi:10.1098/rsta.1909.0009 AU - Duffield, W. ER -