| 摘要 |
A device enabling an individual to practice breath control. A container which has a transparent wall accommodates in its interior a light-weight article such as a ball which can be raised by currents of air blown into the container. The air can discharge out of the container through an opening with which a second opening of a selected size can be placed in registry, so that by selecting an opening of a suitable size to be placed in registry with the first opening it is possible to control the resistance to discharge of air out of the container, thus enabling the operator to practice breath control.
|
