I meant to say something about the subject title, 'Graduated Forcefalls'.
A better term is cascade since that is exactly what happens, a kind of
parametric down conversion, successive divisions of the frequency to
produce ever lower frequencies...
Graduation is more precisely a 'tuning' of the mass....
So, 'cascaded forcefalls' might make more sense, though cascade says it
all to me....
-- Jerry W. Decker / jdecker@keelynet.com http://keelynet.com / "From an Art to a Science" Voice : (214) 324-8741 / FAX : (214) 324-3501 KeelyNet - PO BOX 870716 - Mesquite - Republic of Texas - 75187