Wā'ter-hăm'mer, n.
n. A vessel partly filled with water, exhausted of air, and hermetically sealed. When reversed or shaken, the water, being unimpeded by air, strikes the sides with a sound like that of a hammer.
n. A vessel partly filled with water, exhausted of air, and hermetically sealed. When reversed or shaken, the water, being unimpeded by air, strikes the sides with a sound like that of a hammer.