tumbler-tank

Century Dictionary and Cyclopedia

1. n. In plumbing, a flush-tank in which an oblong tilting receiving vessel pivoted midwise, and having a midwise partition, is fitted and poised in such manner that when water runs into one of the compartments of the vessel a quantity must accumulate before it can tilt and discharge its contents, and in such manner that the tilt brings the opposite compartment into position to be filled. A considerable volume of water is thus suddenly discharged at each tilting of the receiving vessel, although the stream affording the supply may be small.