Looms introduced as a substitute for spinning wheels in 1776.

The velocity of a severe storm is 36 miles an hour; that of a
hurricane, 80 miles an hour.

National ensign of the United States formally adopted by Congress in
1777.

A square acre is a trifle less than 209 feet each way.

Six hundred and forty acres make a square mile.

A "hand" (employed in measuring horses' height) is four inches.

A span is 10-7/8 inches.

Six hundred pounds make a barrel of rice.

One hundred and ninety-six pounds make a barrel of flour.

Two hundred pounds make a barrel of pork.

Fifty-six pounds make a firkin of butter.

The number of languages is 2,750.

The average duration of human life is 31 years.