Ebook wait

11 ft. 697 44 lb.
12 ft. 905 57 lb.
The material must be cut in suitable shaped gores or segments. In
this article we shall confine ourselves to a 10-ft. balloon. If
the balloon is 10 ft. in diameter, then the circumference will be
approximately 3-1/7 times the diameter, or 31 ft. 5 in. We now
take one-half this length to make the length of the gore, which is
15 ft. 7-1/2 in. Get a piece of paper 15 ft. 7-1/2 in. long and 3
ft. wide from which to cut a pattern, Fig. 1. A line, AB, is drawn
lengthwise and exactly in the middle of the paper, and a line, CD,
is drawn at right angles to AB and in the middle of the paper
lengthways. The intersecting point of AB and CD is used for a
center to ascribe a circle whose diameter is the same as the width
of the paper, or 3 ft. Divide one-quarter of the circle
[Illustration: Pattern for Cutting the Segments]
into 10 equal parts and also divide one-half of the line AB in 10
equal parts. Perpendicular lines are drawn parallel with the line
CD intersecting the division points made on the one-half line AB.


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