{HEAD ~ A mechanism} is provided for adjusting {TAIL ~ the ratio} of the volume to the compliance of the reference cell, so that this ratio may be made exactly equal to the corresponding ratio for the measuring cell 
is provided for adjusting
{ HEAD ~ A mechanism } is provided for adjusting { TAIL ~ the ratio } of the volume to the compliance of the reference cell , so that this ratio may be made exactly equal to the corresponding ratio for the measuring cell
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL 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 OTH OTH OTH