Where is the electric chair "Old Smokey" which was used to execute the notorious murderer Richard Hauptmann now on display? 
Old Smokey: Old Smokey is a euphemistic name given to the state prison electric chair in New Jersey, which is on display at the New Jersey State Police Museum. Richard Hauptmann:  Hauptmann proclaimed his innocence to the end, but he was convicted of first degree murder and executed in 1936 in the electric chair at the New Jersey State Prison.
New Jersey State Police Museum