The height of {HEAD ~ teeth} of {TAIL ~ the toothed arch block} is approximately equal to the height of teeth on the ratchet wheel 
of
The height of { HEAD ~ teeth } of { TAIL ~ the toothed arch block } is approximately equal to the height of teeth on the ratchet wheel
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH