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In Retrospect
1847
Werner von Siemens refined the pointer telegraph invented by Englishman Charles Wheatstone by synchronizing
the transmitter and receiver electrically – making the new device a major improvement over earlier versions. A year
later a young telegraph company, the “Telegraphen-Bauanstalt von Siemens & Halske,” got its first commission – to
install what would be Europe’s longest telegraph line of its day, from Berlin to Frankfurt am Main.
1953
Siemens researchers developed and patented a special technique for making ultrapure silicon for semiconductor
applications. The discovery revolutionized the entire field of electrical engineering, and also represented a
successful entry into microelectronics, tapping a key technology that also extended into other fields of production.
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