| Description | /1 Letter from Mary E. Swan to Oliver Lodge, written from Farleyside, Westerham, Kent, dated 19 October 1929. Swan thanks Lodge for championing her father (Joseph Swan) as inventor of the electric lamp in his radio talk on electric lighting.
/2 Letter from Kenneth R. Swan to Oliver Lodge, written from 13 Holland Park, W11, dated 19 October 1929. Swan thanks Lodge for saying in his radio talk that the carbon filament lamp was invented by his father, Joseph Swan, not Edison. He corrects Lodge on details of development of the filament. |