In article , Spyke
wrote:
Does anyone know where I can obtain a whistle (or more specifically, 2
or possibly 3) that fits the following requirements?

1) Sounds the same as, or very similar to, a tube train whistle
(specifically 38 Stock).
2) Can be modified to run off compressed air at about 30psi or less.
3) Would be small enough to fit somewhere in or on a 7.25" gauge tube
car. (I.e. less than a foot or so in length).

Any help would be appreciated. 3-chime whistles aren't hard to come by,
but ones with the correct sound appear to be.
I can't afford to go for original 38 stock whistles, as there's no way I
could afford it or guarantee being able to get more than one.

If you want to e-mail me off group, replace news@ with anything else.

8************************************************8

The pitch of whistles is directly related to their length -
making them smaller necessarilly means raising the pitch. If all
you care about is the SOUND, then fitting pipes to the correct
pitch may involve coiling them. An open-ended pipe is half a
wavelength and closed-end pipe is quarter of a wavelength and there
is a difference in sound quality between the two. Luckily,
quarter-wavelength is more common. The wavelength is

wavelength (Metres)= speed of sound (300 M/sec) / Hertz
(cycles/second)

Get a specification of the whistles (it may be a "chord", more
than one note) and get an organ builder to make it for you. The real
thing would sound most authentic - have you any pals in the workshops?

Michael Bell