Some whistles contain a 'pea' while other equally loud ones do not find the spherical object necessary. What is the purpose of the pea?

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The 'Acme Thunderer' - 1884 The original 'Acme Thunderer' was the world's first reliable 'pea' whistle, designed in 1884. Pea whistles contained a small dried pea inside to give a 'warble' sound Mar 27 02, 11:03 PM

Gnomon

The warbling sound actually makes the whistle louder and more piercing. Opera singers add a warble to their voice for the same purpose - this is technically called 'vibrato' - although they don't use a pea to do it! Mar 28 02, 8:37 AM

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