Green metal noise maker

This is a simple but effective noise maker. When the two pieces of metal are squeezed together, the circular depression visible on the underside piece of metal suddenly pops outwards with a loud report. When the pressure is released, the metal returns to its depressed state, emitting another loud pop.

Details

Size Length 95mm
Date First half of the 20th century.
Key Phrases
Category
Ref no N2284