The harmonics for an open cone with slant length ##IMG##
[http://ej.iop.org/images/0031-9120/52/3/035012/pedaa64f1ieqn001.gif] {$L$} are the same as the
harmonics for an open pipe with length ##IMG##
[http://ej.iop.org/images/0031-9120/52/3/035012/pedaa64f1ieqn002.gif] {$L$} . When the cone is
transformed through phases of closed–open conical frusta into a cylinder of length ##IMG##
[http://ej.iop.org/images/0031-9120/52/3/035012/pedaa64f1ieqn003.gif] {$L$} closed at one end, the
fundamental halves and only odd harmonics remain. A simple approach using boundary conditions is
presented in order to understand this remarkable fact. A new free interactive HMTL5 application is
provided which enables the user to hear the resonances of a complete cone transform into the pitches
of a conical frustum closed at the small end, and eventually into the odd harmonics of a closed
cylindrical pipe.