From the tip of the longest finger of the hand to the shoulder joint
is four hands or, if you will, four faces.

_a b c_ are equal and each interval is 2 heads.

[Footnote: Lines 1-3 are given on Pl. XV below the front view of the
leg; lines 4 and 5 are below again, on the left side. The lettering
refers to the bent arm near the text.]