Our roofer is putting the tiles on from today. One of the key aspects is getting the lines of tiles correct. To this end he has made vertical lines converging at the top, and today is using a giant wooden compass, constructed on the spot, to make the horizontal ones.
The wooden beam is pivoted at the top of the tower, and rotates around it. The pencil is held in place by a bracket that is screwed on, and is moved up the wood in increments corresponding to the length of the tiles.
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