Similar principle, for the kiln, the bricks want to expand so the band stops the bricks from pulling apart at the mortar - similarly, for the wind pump, because it is tall and has a a massive wind load acting on the top, the structure wants to bend sideways, compressing the bricks on one side (which is fine) but pulling apart at the mortar those on the other side, which the band prevents.Thank you. Yeah I know the metal bands were used in the kilns for expansion, especially when they are in use. The ones at Gisleham are real beasts and so nice. I just wondered if they were used for the same principle here with changes in temperature.
Part of the appeal of this hobby for me is seeing the simplicity but also the effiicacy of proper old school egineering.