TY - JOUR T1 - Modified Apparatus for the Measurement of Colour and Its Application to the Determination of the Colour Sensations JF - Philosophical Transactions of the Royal Society of London. Series A, Containing Papers of a Math. or Phys. Character (1896-1934) VL - 205 SP - 333 EP - 355 PY - 1906/01/01/ UR - http://dx.doi.org/10.1098/rsta.1906.0010 M3 - doi:10.1098/rsta.1906.0010 AU - de W. Abney, W. ER -