At the time when log driving was active in the Ljusnan river, the logs were stored in this pool and brought into the factory through this conveyor.

Presumably, this arrangement was kept even after the log driving ceased in 1967, as the logs had to be submerged prior to treatment in the factory. A new installation was built in the 1970s to deal with the Swedish winter - http://www.pbase.com/jakobe/image/70040580