Before revision: Thomson had introduced the method of harmonic analysis of tidal patterns in the 1860s and the first machine was designed by Thomson with the collaboration of Edward Roberts ( assistant at the UK HM Nautical Almanac Office), and of Alexander Légé, who constructed it.The Proceedings of the Inst.C.E.
After revision: 1845-1933,Thomson had introduced the method of harmonic analysis of tidal patterns in the 1860s and the first machine was designed by Thomson with the collaboration of Edward Roberts ( assistant at the UK HM Nautical Almanac Office), and of Alexander Légé, who constructed it.The Proceedings of the Inst.C.E.