Re: frank and other monsters

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

Original poster: "Tim Flood by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tflood-at-stllabs-dot-com>

While we're on the subject, in the early movie version there is a device
mounted on the lab wall that appears to be some type of rotary spark gap.
When the device is swtched off and `coasting down' there is quite a bit of
audible bearing noise or some sort of mechanical intereference causing a
grating sound. 
 
Any ideas what this device actually is and how it might be built?
 
Thanks,
 
 
Tim Flood