In {HEAD ~ the method}, ice is pressed under the water along an inclined surface formed by a bar screen or {TAIL ~ a grating} 
In { HEAD ~ the method } , ice is pressed under the water along an inclined surface formed by a bar screen or { TAIL ~ a grating }
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL