What is "turnspits"

Usage examples of "turnspits".

And as these are only reserved for this purpose, so in many places our mastiffs (beside the use which tinkers have of them in carrying their heavy budgets) are made to draw water in great wheels out of deep wells, going much like unto those which are framed for our turnspits, as is to be seen at Roiston, where this feat is often practised.

The second sort of them are called turnspits, whose office is not unknown to any.