[Drawn for this work by L. W. Truesdell, Tinman, Owego, N. Y.] Original.

Fig. 14.

Let the circle AB represent the size of the measure; span the dividers from K to F three-quarters of the diameter; describe the semicircle DKE; move the dividers to G the width of the lip required, and describe the semicircle KPJ, which will be the lip sought.