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What is an inch of rain?

--The late weekly return of the British Registrar-General gives the following interesting information in respect to rainfall:

‘ "Rain fell in London to the amount of 0.43 inches, which is equivalent to forty-three tons of rain per acre. The rainfall during last week varied from thirty tons per acre in Edinburg to two hundred and fifteen tons per acre in Glasgow. An English acre consists of 6,272,640 square inches; and an inch deep of rain on an acre yields 6,272,640 cubic inches of water, which, at 277,274 cubic inches to the gallon, makes 22,622.5 gallons; and, as a gallon of distilled water weighs ten pounds, the rainfall on an acre is 226,225 pounds avoirdupois; but 2,240 pounds are a ton, and consequently an inch deep of rain weighs 100,993 tons, or nearly one hundred and one tons per acre. For every one-hundredth of an inch a ton of water falls per acre. If any agriculturist were to try the experiment of distributing artificially that which nature so bountifully supplies, he would soon feel inclined to 'rest and be thankful.'"

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