Horizontal and parallel lines with AB are drawn intersecting the
division points made on the one-quarter circle and intersecting
the perpendicular line drawn parallel with CD. A line is now drawn
from B to E and from E to F, and so on, until all the intersecting
lines are touched and the point C is reached. This will form the
proper curve to cut the pattern. The paper is now folded on the
line AB and then on the line CD, keeping the marked part on the
outside. The pattern is now cut, cutting all four quarters at the
same time, on the curved line from B to C. When the paper is
unfolded you will have a pattern as shown in Fig. 2. This pattern
is used to mark the cloth, and after marked is cut the same shape
and size.
The cloth segments are sewed together, using a fine needle and No.
70 thread, making a double seam as shown in Fig. 3. When all seams
are completed you will have a bag the shape shown in Fig. 4. A
small portion of one end or a seam must be left open for
inflating. A small tube made from the cloth and sewed into one end
will make a better place for inflating and to tie up tightly.
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