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Example.

Suppose 5 inches dip, by cold area.

24.87 area.
5 inches.
———
12435
Discount one-tenth 12435
————
111.915 neat libs. wt.
Duty - 2.25 or 2¼d. per lib.
————
559575
223830
223830
—————
12)251.80875
———4
s.d.———
20 11 3.23500 , or,
 
L. 1 : 0 : 11 : 3.235. See Table.

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