waygate

plural waygates

1. The tailrace of a mill.

   1 and 2 are connected to one pipe, B, which leads to the pitshaft -- descends close to the side of the same — and then passes horizontally along the top of the waygate, whence branches lead off to the different workings where the men are employed

   1849, John Warburton, “Harvey's apparatus for cleansing potters' materials from particles of iron”, in Iron: An Illustrated Weekly Journal for Iron and Steel