A sawmill such as Bessler's wheel would have powered.

Bessler probably acquired his timber from a sawmill and yesterday I came across this amazing saw mill built in 1673 at the Willermershof farmstead in Schwarzenbach, this 'Knocking' Saw was in use until 1963 when it was moved to Vogtsbauernhof in south-eastern Germany. 

You can see from the video that it is driven by a waterwheel which uses precisely the same 'three tusked cams', or lifting arms, fixed with tenons, that are evident in one of Bessler's drawings.

http://www.youtube.com/watch?v=R0teYGke_Lc

From the above video, "farmsteads operated their own saws when the property had a considerable amount of forest area. They cut their own timber for private use as well as to sell commercially. Contracting the saws out to other farmers was also an additional source of income. There was a widespread use of 'knocking' saws in the Black Forest starting in the 16th century. The technique originated in the 13th century.

The 'knocking' saws is driven by a middle-shot water wheel. This turns a shaft axis that has three tusked cams, or lifting arms, fixed with tenons. When rotated, these cams knock against the overhead saw frame, thereby lifting it. With each turn of the water wheel, the saw frame is hit upwards three times. 

This hitting motion creates a knocking sound that can be heard from quite a distance away. When the frame has reached its highest point, it drops down suddenly. Upon falling, the saw blade cuts the trunk. The trunk is fastened down to a sled. By dropping, the saw frame sets a mechanism into motion shoving the sled towards the blade of the saw.

Trunks measuring up to 20 ft in length could be cut. Sawing a 20 ft board or plank takes about 45 minutes. Generally, boards and planks of a thickness from 3/4 to 3" were cut. Squared timber, such as used to build houses, had to be clouted with an ax. Boards and planks were needed to build houses, furniture, and wagons."

Boards of 3/4 of an inch  still sound a little on the thick side for Besslers' wheel but I guess they could be trimmed down some more - or even sliced in half.  Teuber described the Merseburg wheel as being covered by thin deals which I presume would have been thinner than 3/4 of an inch

It seems clear that a similar mechanical arrangement could have powered other kinds of mills.

NB More clues to come in next post.

JC

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