The Sandstone block with the orifice is inclined, so that the jet is directed downwards at twenty degrees to the horizontal:

The diameter of the hole is 0.155 m. (6.1 inches).The hole appears to have been bored for part of the way only.Behind the bored part there is a slot or channel cut from the top of the block, the top of this slot is filled by a small tightly fitting block of stone. When found the orifice was blocked by timber and stones:

The oak beam is visible in the water below the orifice block

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