{HEAD ~ A time switch} comprises terminals spaced around a slip ring connected to {TAIL ~ a voltage source}  
{ HEAD ~ A time switch } comprises terminals spaced around a slip ring connected to { TAIL ~ a voltage source }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH