X you shall form thus: Draw two vertical lines e. f. and g. h. distant
respectively one-tenth part of the line a. b. from the sides a. c. and
b. d. Then draw the two limbs intersecting one another in the form of a
cross--the broad one so that at top, & with its hither side it shall
touch e., & at the bottom, and with its farther side h.; but the narrow
limb so that at top, and with its farther side it may touch g., & at
bottom, with its hither side f. Then add its projections, touching, at
top and bottom, the four angles a. b. c. d., & choose a semi-diameter of
the larger circle of the length of a fifth part of a. b.; & with that
you shall round out the four greater angles; but for the lesser circle
you shall take a diameter as long as two-thirds the width of the broader
limb.
Or you may vary X thus: Let everything be left as before except the
narrower limb, which at top you shall make more erect by one-half the
breadth of the wider limb; and so the upper part of the letter shall be
less and narrower than the lower, and shall have a different aspect, as
is shown below.
[Illustration: X]