Page 372: "Coil, Ruhmkoff" changed to "Coil, Ruhmkorff".
Page 382: "Daniells" changed to "Daniell".
Page 396: "graphite a native; form of carbon" changed to "graphite; a native form of carbon".
Page 401: "Ruhmkoff Coil. (See Coil, Ruhmkoff.)" changed to "Ruhmkorff Coil. (See Coil, Ruhmkorff.)"