Karmansbo hammer.
Transcript from info.

Karmansbo is a well preserved old iron factory environment. Her you find the manor, labor living, the black smith, coal house and factory office. The manor is build, about 1750 and very beautiful and built in strictly symmetrical planes.
The works in Karmansbo is a splendid example for the break through of industrialism.  The production tools and environments  show the technics and working conditions during second part of 1800. Heaters, hammers and machines can still be used and demonstrated.
I one want to see how a family worker lived in the beginning of 1900, there is an apartment opened for show. These house was called "The length of Black Smiths living".

Two small hammer works.
About 400 years ago Karmansbo started to get people living there. The stream of Hedstream delivered power for water wheels and this decided the placement of the iron works.
Gustav Vasa changed the economic policy and instead to export  Osmund iron to the Hansan in Baltic, the pig iron should be refined in Sweden. Hammer works with so called German forgings started to be built. The new export product became bar iron.
The map from 1763 shows that Hed stream in the past had two creeks and both were used. Karmansbo forging, the oldest part was built at the east part of the water fall. Norrhammar was built on the island etween the creeks.
A typical hammer works had two heaters and one bar iron hammer. The blowers and hammer was driven by each water wheel. Up to 6 and 8 workers could produce 150 tons of bar iron a year.
There were about 500 hammer works around in Bergslagen. With all these small units Sweden was the leading producer and exporter of bar irons.

All mergings.
During the first 200 years not so much happened in Karmansbo. But 1812 the first merging happened between all forgings nearby. The eastern creek was closed and the works of Norrahammar was enlarged and got it's new name Karmansbo. The production started to increase.

The machinery years Lancashire method was introduced.
With the help of steam machinery, modern transport systems, rolling mils and coke based technics in England, the slow working German forging was changed. The answer from Sweden became later to use the Lancashire system (after the English way), started 1850. More effective welding furnaces, more heavy hammers and higher temperatures in the furnaces. This gave a much better quality, closed and more forgeable iron. Lost market shares could be retaken.

Karmansbo at the end of 1800.
1873 was ready and look like you can see today and equipped with the most modern technic. The rolling mill had replaced the old horizontal bar forging, blowing machines replaced old type of bellows. The industrialization had begun. Production volume was raised, several more welding ovens were added, more people were employed. Around 1900 the production reached it's peek, when 4000 - 5000 tons a year were delivered. During this time between 70 - 75 workers were employed. Including bricks and farming there were about 1000 persons working at Karmansbo.
The eagle, the famous iron mark was showing highest quality. These bars irons were exported over whole of the world, mostly England, there it was used for Sheffield well known tool steel.
The works was in use up to 1958. At this time the heavy hammer became silent which generations of living people in Karmansbo were used to hear around the clock.