wrest

Fig. 6 is the outline of a wheel having 40 buckets. […] The partitions, which determine the form of the buckets, conſiſt of three different planes or boards AB, BC, CD, which are variouſly named by different artiſts. We have heard them named the Start or Shoulder, the Arm, and the Wrest (probably for wriſt, on account of a reſemblance of the whole line to a human arm); […]