This is a currency note from the Bank of the United States and is not an obligation of the United States government. The Treasury Department did not issue notes intended for circulation as currency until 1862.
The grommet panel must be a minimum of 70 inches wide, between the side hem seams, to provide just slightly more than 1.5 times fullness on the 40-inch space.
For example, for two times fullness on the 40-inch span, the result would be 80 inches of panels. 80 divided by 7 equals 11.4. Round this up to 12. 12 times 7 equals 84. For two times fullness, the panel must be at least 84 inches wide between the outside edge hems.