TY - JOUR T1 - Experiments and Observations upon the Properties of Light JF - Philosophical Transactions of the Royal Society of London (1776-1886) VL - 140 SP - 235 EP - vii PY - 1850/01/01/ UR - http://dx.doi.org/10.1098/rstl.1850.0013 M3 - doi:10.1098/rstl.1850.0013 AU - Brougham, L. ER -