MOTM

In a message dated 99-12-02 19:42:16 EST, you write:

<< The slider that goes across
 the top is mechanically linked to a potentiometer that is used to control
 the frequency  >>




larry,
i meant to comment earlier on this point.....if my memory serves me correctly 
something like this was first used in the 1930's with the french made  "ondes 
martenot"  with the scale notes maked on the supporting board. 
best,
dave