Pawn ruler

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The farmer's ruler is a slang term from the aviation language . Whenever flying machines fly on sight and they orientate themselves on striking linear structures such as a river, a motorway, a ridge-like low mountain range such as the Wiehengebirge , one also speaks of the farmer's ruler.

Individual evidence

1. ↑ Report from ORF: Helicopters flew to the farmer's ruler , accessed on July 30, 2017