When the member is in its upper position, the ring is in the path of the air stream emitted by the fan to produce {TAIL ~ a stream} of {HEAD ~ bubbles} 
When the member is in its upper position , the ring is in the path of the air stream emitted by the fan to produce { TAIL ~ a stream } of { HEAD ~ bubbles }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD