1) A ‘head’ driven to serve as a watercourse, although it might also provide ventilation.

1633 Abraham Shaw shall ... drive every sough which he shall take in hand … till he come to take the last waterhead … and shall have allowance of the fourth part of the charges, Northowram

1702 that the waterhead bee carried on and kept upon a true Levell so that there may bee free Passage for winde and water, Thornton.

dates 1633 1702

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