An improved tank or aquarium for the preservation or culture of live fish and aquatic animals

摘要

450,918. Emptying fish tanks. THOMAS, V. J., 27, Kingsway, West Wickham, Kent. Jan. 7, 1936, No. 568. [Class 21] [See also Group VI] Water from the bottom of a fish tank flows through a perforated pipe B with an upstanding part A and out through a nozzle C. The flow is interrupted by a cork in the nozzle. Fresh water is introduced at the top of the tank.