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48.
a b goes 4 times into a c and 9 into a m. The greatest
thickness of the arm between the elbow and the hand goes 6 times
into a m and is equal to r f. The greatest thickness of the arm
between the shoulder and the elbow goes 4 times into c m, and is
equal to h n g. The smallest thickness of the arm above the elbow
x y is not the base of a square, but is equal to half the space
h 3 which is found between the inner joint of the arm and the
wrist joint.
[11]The width of the wrist goes 12 times into the whole arm; that is
from the tip of the fingers to the shoulder joint; that is 3 times
into the hand and 9 into the arm.
The arm when bent is 4 heads.
The arm from the shoulder to the elbow in bending increases in
length, that is in the length from the shoulder to the elbow, and
this increase is equal to the thickness of the arm at the wrist when
seen in profile. And the space between the bottom of the chin and
the parting of the lips, is equal to the thickness of the 2 middle
fingers, and to the width of the mouth and to the space between the
roots of the hair on the forehead and the top of the head [Footnote:
Queste cose. This passage seems to have been written on purpose to
rectify the foregoing lines. The error is explained by the
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