Editing Werner von Siemens (section)

===Later years===
Apart from the pointer telegraph, Siemens made sufficient contributions to the development of [[electrical engineering]] that he became known as the founding father of the discipline in Germany. He built the world's [[Siemens locomotive of 1879|first electric passenger train]] in 1879,<ref>E. Hoffmann: ''Telegraphy and Electrical Engineering at the Berlin Trade Exhibition in 1879.'' Reprint from: Archiv für Post und Telegraphie 1879, No. 14. Berlin 1879. ([https://www.technik-in-bayern.de/mehr-technik/technikgeschichte/die-erste-elektrische-lokomotive-der-welt-im-blick-der-zeitgenossen Quote p. 17–19] at technik-in-bayern.de)</ref> and the first electric [[elevator]] in 1880.<ref>{{Cite web|url=https://www.thoughtco.com/history-of-the-elevator-1991600|title=The History of Elevators From Top to Bottom|website=ThoughtCo}}</ref> His company produced the tubes with which [[Wilhelm Conrad Röntgen]] investigated x-rays. He claimed invention of the [[dynamo]] although others invented theirs [[Dynamo#Practical designs|around the same time]]. On 14 December 1877 he received German patent No. 2355 for an electromechanical "dynamic" or moving-coil transducer, which was adapted by A. L. Thuras and E. C. Wente for the [[Bell System]] in the late 1920s for use as a [[loudspeaker]].<ref>Ed. M. D. Fagen, "A History of Engineering and Science in the Bell System: The Early Years", Bell Laboratories, 1975, p. 183.</ref> Wente's adaptation was issued {{US patent|1,707,545}} in 1929.

In May 1881, Siemens & Halske inaugurated the world's first electric [[tram]] service, in the [[Gross-Lichterfelde Tramway|Berlin suburb of Groß-Lichterfelde]].<ref>{{cite web |title=Werner von Siemens |url=https://new.siemens.com/global/en/company/about/history/stories/werner-von-siemens.html |website=siemens.com Global Website |access-date=2021-08-14}}</ref> Siemens is also the father of the [[trolleybus]], which he initially tried and tested on 29 April 1882, using his "[[Electromote|Elektromote]]".