Re: Air Quenching (wasRe: Magnetic quenching).

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: Mddeming-at-aol-dot-com 

In a message dated 3/15/04 11:20:21 AM Eastern Standard Time, 
tesla-at-pupman-dot-com writes:
 > Original poster: "Malcolm Watts" <m.j.watts-at-massey.ac.nz>

 > simply, a disc with holes positioned around the periphery to rotate
 > above a static gap so that an interrupted airblast could be fed in a
 > timed manner at the gap. Also opens the possiblity of phasing the
 > blasts using John Freau's rotary phasing circuitry. There are several
 > variations on this theme which spring to mind.

Looks as the structure of a siren. Be prepared for a lot of noise.

Antonio Carlos M. de Queiroz

Hi Malcolm, Antonio, All,
     Definitely will be some sound. IIRC, the Hammond Organ Co. in the 
1950s used a "tone wheel" (disk with holes to interrupt air stream) to 
generate the basic pitches which were then amplified and shaped with filter 
circuitry.
FWIW, at 120 pps it should be a slightly flattened low B.

Matt D.