Other musical instruments used are foghorns and cow bells. The instrumentation used in the song includes brass, foghorns and cow bells. The convoy proceeded at 4 knots an hour while the foghorns sounded. The lighthouse was automated in the 1990s, and a massive array of electronic foghorns erected. He also improved foghorns and created his own wireless communication system prior to Marconi's wireless. The foghorns were added between 1895 and 1897. Foghorns were incorporated in the 19th century to provide warning in low visibility. Between 1876 and 2005 the NLB also maintained foghorns at a number of locations. In the scene where Elisabet meets Alma in her bedroom, foghorns accompany Werle's music.