TY - JOUR T1 - Magnetical Observations in the Britannia and Conway Tubular Iron Bridges JF - Philosophical Transactions of the Royal Society of London (1776-1886) VL - 163 SP - 331 EP - 339 PY - 1873/01/01/ UR - http://dx.doi.org/10.1098/rstl.1873.0008 M3 - doi:10.1098/rstl.1873.0008 AU - Airy, G. ER -