Abstract: There is provided a stable drain plug device in which main bodies (the plug lid and the ascending or descending member) are not floated under a pushing operation of the operating part.

Abstract: A mercury supplying method capable of always supplying a constant amount of mercury into a chamber part easily by executing measurement and ejection of the mercury at the same time. A small diameter pipe as a mercury supply path, is inserted through a glass tube elongating from a chamber part of an arc tube from above so as to have the tip part thereof substantially reaching into the chamber part, and connecting the upstream side of the sealed mercury supply path (mercury barrel) with a gas pressure adjuster. The gas pressure adjuster keeps the inside of the mercury supply path (mercury barrel) at a predetermined pressure so as to maintain the inside of the small diameter pipe in the state filled with mercury as well as applying a predetermined pressure to the mercury in the small diameter pipe for a predetermined time and thus ejecting a predetermined amount of mercury from the small diameter pipe tip part so as to be dropped and supplied to the chamber part.

Abstract: Hydrotherapy-tub multiple slot flow device includes slotted outlets on a body for discharge of fluids from a nozzle in a substantially coplanar flow and in a selected direction. The body is adapted for mounting on an inner surface of a hydrotherapy tub and attachable to first and second fluid supply conduits. Further, the body has a first inlet for flow of a fluid from the first fluid supply conduit and a second inlet for flow of a fluid from the second fluid supply conduit.