Does anyone know the mathematical formula for calculating the actual
volumetric displacement of a moving vacuum feeder bellows?  I would
imagine it would take into account the overall dimensions of the feeders,
factoring in radian open and closed (span of travel) and speed of
operation.  Units may be cubic inches or cubic centimeters, either one.
Perhaps the original factory pneumatic designers had access to this
formula?

Thanks in advance,

Stephen K Goodman - Professional Player Piano
& Nickelodeon Restoration Services
Tarpey Village (Fresno/Clovis) California, USA
http://www.mechanicalmusicrestoration.com/