In 1842 at a meeting of the British Association in Manchester, there was a discussion on the wave or particle nature of light in which Hamilton, MacCullagh, Bessel, Jacobi, Peacock, David Brewster and others took part.
Sa 1842 sa isang pulong ng British Association sa Manchester, nagkaroon ng isang diskusyon sa kumaway o particle kalikasan ng mga ilaw na kung saan Hamilton, MacCullagh, Bessel, Jacobi, richboat, David Brewster at iba kinuha bahagi.