undershot wheel

undershot wheel

[′ən·dər‚shät ‚wēl]
(mechanical engineering)
A water wheel operated by the impact of flowing water against blades attached around the periphery of the wheel, the blades being partly or totally submerged in the moving stream of water.
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References in periodicals archive ?
If the only source of moving water available was a fast-moving stream with little change in elevation, the undershot wheel was used.
The undershot wheel located along the front of the mill was added in the late 1950s and serves as decoration only.
The water wheel pit was sunk in 1852 to house a wooden eight-foot diameter undershot wheel, which was replaced in 1906 with an iron one made in a foundry in Aberystwyth.