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Updated: April 30, 2025
Although this brings the reader up to the year 1879, one must turn back two years and accompany Edison in his first attack on the electric-light problem. He was still busily engaged on the telephone, on acoustic electrical transmission, sextuplex telegraphs, duplex telegraphs, miscellaneous carbon articles, and other inventions of a minor nature.
The method of telegraphic communication devised by Professor Morse has been continued in general use in this country, but instead of requiring separate wire for each circuit as formerly, six independent circuits are now operated simultaneously over a single wire by the use of the sextuplex apparatus.
Here he continued, moreover, his earlier work on the quadruplex, sextuplex, multiplex, and automatic telegraphs, and did his notable pioneer work in wireless telegraphy.
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