{HEAD ~ The device} 1, wherein {TAIL ~ said photoreceiver} is a CdS photoresistor 
wherein
{ HEAD ~ The device } 1 , wherein { TAIL ~ said photoreceiver } is a CdS photoresistor
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH