For use with ripple tank, simple form. A disc of 250 mm diameter with 12 equispaced slots and a finger hole, rotating on its axis, with handle.
For use with ripple tank, simple form. A disc of 250 mm diameter with 12 equispaced slots and a finger hole, rotating on its axis, with handle.
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For use with ripple tank, simple form. A disc of 250 mm diameter with 12 equispaced slots and a finger hole, rotating on its axis, with handle.