TY - JOUR T1 - Description of a Sounding Board in Attercliffe Church, Invented by the Rev. John Blackburn, Minister of Attercliffe-Cum-Darnall, Sheffield JF - Philosophical Transactions of the Royal Society of London (1776-1886) VL - 118 SP - 361 EP - 363 PY - 1828/01/01/ UR - http://dx.doi.org/10.1098/rstl.1828.0020 M3 - doi:10.1098/rstl.1828.0020 AU - Blackburn, J. ER -