TY - JOUR T1 - Reduction of Error by Linear Compounding JF - Philosophical Transactions of the Royal Society of London. Series A, Containing Papers of a Math. or Phys. Character (1896-1934) VL - 221 SP - 199 EP - 237 PY - 1921/01/01/ UR - http://dx.doi.org/10.1098/rsta.1921.0007 M3 - doi:10.1098/rsta.1921.0007 AU - Sheppard, W. ER -