NOT gate at Porth Wen Brickworks

 

This gate is on the hill above Porth Wen Brickworks on Anglesey. I'm calling it a NOT gate because although the hinge is there and still turns, there is no gate. In electronics, a NOT gate is what is used to turn a 1 into a 0 or a 0 into a 1 in a logic circuit. On other words, what comes out is NOT what goes in; it is the opposite.