- Multiplex Working.
In the later years of his life he was engaged in developing a system of multiplex telegraphy.
- Grouping of Segments in Multiplex System.
The Murray automatic system is not regarded as suitable for short telegraph lines or moderate traffic, printing telegraphs on the multiplex principle being considered preferable in such circumstances.
The actual number of sets of apparatus it was possible to work multiplex depended upon the length of the line, for if the latter were long, retardation effects modified the working conditions.