Editing Optical telegraph (section)

====Rebuilding the network====
The post of Telegraph Inspector was created as early as 1811, but the telegraph in Sweden remained dormant until 1827 when new proposals were put forward. In 1834, the Telegraph Institution was moved to the Topographical Corps. The Corps head, Carl Fredrik Akrell, conducted comparisons of the Swedish shutter telegraph with more recent systems from other countries. Of particular interest was the semaphore system of [[Charles Pasley]] in England which had been on trial in Karlskrona. Tests were performed between Karlskrona and [[Drottningskär]], and, in 1835, nighttime tests between Stockholm and Fredriksborg. Akrell concluded that the shutter telegraph was faster and easier to use, and was again adopted for fixed stations. However, Pasley's semaphore was cheaper and easier to construct, so was adopted for mobile stations. By 1836 the Swedish telegraph network had been fully restored.<ref name="Holzmann & Pehrson, p. 120"/>

The network continued to expand. In 1837, the line to Vaxholm was extended to [[Furusund]]. In 1838 the Stockholm-[[Dalarö]]-[[Sandhamn]] line was extended to [[Landsort]]. The last addition came in 1854 when the Furusund line was extended to [[Arholma]] and [[Söderarm]].<ref name="Holzmann & Pehrson, p. 120"/> The conversion to electrical telegraphy was slower and more difficult than in other countries. The many stretches of open ocean needing to be crossed on the Swedish archipelagos was a major obstacle. Akrell also raised similar concerns to those in France concerning potential sabotage and vandalism of electrical lines. Akrell first proposed an experimental electrical telegraph line in 1852. For many years the network consisted of a mix of optical and electrical lines. The last optical stations were not taken out of service until 1881,{{sfn|Greene|2003|page=159}} the last in operation in Europe. In some places, the [[heliograph]] replaced the optical telegraph rather than the electrical telegraph.<ref>Holzmann & Pehrson, pp. 120–126</ref>}