TL5770 : Wicken Windmill - auxiliary drives

taken 2 years ago, near to Wicken, Cambridgeshire, Great Britain

Wicken Windmill - auxiliary drives
Wicken Windmill - auxiliary drives
The bottom floor is brick built and carries the vertically boarded smock mill on its top edge. This is looking up at the underside of the stone floor with the great spur wheel to the left driving an auxiliary drive shaft by a gear ring on its lower face. One of the tentering governors is visible.

James Watt 'borrowed' the miller's tentering governor to control the speed of his rotative steam engine. He did not claim to have invented the governor per se.
Wicken Windmill
Wicken windmill is a preserved 12 sided smock mill in the Cambridgeshire village of Wicken. It is not to be confused with the nearby wind pump TL5670 : Wicken Fen windpump.
This example was built in 1813, grinding corn for bread and for animal feed. With the slow decay of small scale milling from 1914 Wicken because disused by 1930. After years of rot enthusiasts restored the building to its present working state. There are two pairs of working stones (once three) along with flour dresser and all the usual mill machinery. Access and photography is excellent. Archive LinkExternal link
Tentering - molinological application
In a mill context, tentering is changing the distance (gap) between the runner stone and the bed stone. Decreasing the distance results in a finer grain. As the stones go faster there is a natural tendency for the runner to rise and the tentering mechanism can be adjusted to counter this. In many windmills this is done by a governor that automatically compensates for the tendency of the runner to rise. In watermills it is done by hand with mechanisms of varying elegance. In this case, the second order lever at the bottom raises or lowers the footstep bearing that the spindle carrying the stone nut is supported by. The adjustment is by a vertical lead screw on the other side of the frame and in easy reach of the miller.
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TL5770, 82 images   (more nearby )
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Date Taken
Saturday, 14 May, 2016   (more nearby)
Monday, 26 February, 2018
Geographical Context
Historic sites and artefacts 
Primary Subject of Photo
County (from Tags)
Subject Location
OSGB36: geotagged! TL 5705 7057 [10m precision]
WGS84: 52:18.6470N 0:18.1395E
Camera Location
OSGB36: geotagged! TL 5705 7057
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Other Tags
Milling Machinery  Wicken 

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