@incollection{Graf2012,
  author    = {Johannes Graf},
  title     = {Steinheils Waage, Bains Schieber, Hipps Taster. Zur Genese des Schalters bei Elektrouhren 1840-1860},
  series = {Bildtelegraphie. Eine Mediengeschichte in Patenten (1840-1930)},
  publisher = {transcript},
  address   = {Bielefeld},
  isbn      = {978-3-8376-1225-7},
  pages     = {161 -- 187},
  year      = {2012},
  language  = {de}
}