Before the stairwell saw was introduced, you could only get two boards from each log by splitting it with an axe. With the rise saw, many planks could be cut from one log, which increased efficiency considerably. This was especially important for exports, as there was a great demand for planks and boards in Europe.
The saw by the Gjersjø river is a reconstructed version that shows how hydropower was used to power the saw blade. This saga is a great example of how technology from the Middle Ages was used to make efficient use of natural resources. Visitors can watch demonstrations of the saw each spring and fall, and learn about its importance to local industry and trade.
The boom saw played a crucial role in the development of the Norwegian timber trade and contributed to the growth of several small towns along the coast. It made it possible to produce lumber faster and more efficiently, which led to increased exports and economic growth. At the end of the 1800s, the boom saw was gradually replaced by circular saws, which had simpler mechanics and a higher cutting speed.
The boom saw we see here provides a fascinating insight into historical technology and industry. It shows how innovation and the use of natural resources have shaped society and the economy over time and is part of Norway's industrial heritage that helped build the country.
There is also a Lokomobile sawmill on the site, a portable steam engine for operating a sawmill. In 1850, the first Norwegian steam engine was produced at Myrens Verksted in Christiania. At Ljansbruket, the first locomobile came in 1900 and it employed 20 men and the owners continued to expand the business and at its peak had 16 locomobiles. The locomobile is on loan from Follo Museum.