This wooden model was built by Jonas Norberg in 1761. It was created according to Christopher Polhem´s construction of a lock (water navigation) in Stockholm. Norberg worked closely with Polhem and knew the construction in detail. The model is part of the Swedish Royal Model Chamber and was used instead of drawings in case the construction needed to be repaired. The model is now part of the collections of the Swedish National Museum of Science and Technology. TM 2027 (TEKS0021755)
Read more about Polhem on Wikipedia.