sentences:  Installations started in July 1909, but work progressed slowly, in part because of the slow progress of the foundation work.This was partially accelerated with workforce from Christiania (Oslo), but they were again hindered because local lumber could not be used for the scaffolding.There was not sand of the necessary quality for concrete in the immediate area, so an aerial tramway was constructed from Bjørnevatn to Sandneselva.