Braun also gave an interesting solution of the problem of directive telegraphy.'
For his connexion with the growth of telegraphy, see Nature, xi.
He not only guided the growth of scientific telegraphy on land wires, but made the earliest experiments with submarine cables, foreseeing the practicability of this means of communication as early as 1840.
Aluminium conductors have been employed on heavy work in many places, and for telegraphy and telephony they are in frequent demand and give perfect satisfaction.
In 1873 he was appointed professor of physics and telegraphy at the Imperial College of Engineering, Tokio.
