The current issue of Live Steam magazine (Jan./Feb. '03) has an
article describing a steam calliope built by Conrad Milster.  It is
the first in a series and includes dimensions for the whistles he built
(he rolled his own tubing from copper).  It appears that the instrument
is played via a keyboard on an umbilical which contains electric wiring
for solenoid control.  This will likely be covered in a future article.

John Haskey

 [ Conrad Milster is Chief Engineer of the power plant at Pratt
 [ Institute in Brooklyn, NY, which still operates three 19th century
 [ reciprocating steam engines that spin the dynamos.  -- Robbie