Since heat is pumped from {HEAD ~ window} 12 to cooling channel 46, the coolant in cooling channel 46 need not be maintained at a temperature below the target temperature of {TAIL ~ the skin}, as is the case in the FIG 1 embodiment 
Since heat is pumped from { HEAD ~ window } 12 to cooling channel 46 , the coolant in cooling channel 46 need not be maintained at a temperature below the target temperature of { TAIL ~ the skin } , as is the case in the FIG 1 embodiment
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH