Davy, H Humphry (1823). "On a New Phenomenon of Electro-Magnetism". Philosophical Transactions of the Royal Society of London. 113. London: 153–159. doi:10.1098/rstl.1823.0015. S2CID117591814.
Davy, H Humphry (1823). "On a New Phenomenon of Electro-Magnetism". Philosophical Transactions of the Royal Society of London. 113. London: 153–159. doi:10.1098/rstl.1823.0015. S2CID117591814.