There is a difference between a ton of hard coal and one of soft coal. For that matter, coal from different mines whether hard or soft, differs in weight, and consequently in cubic measure, according to quality. Then there is a difference according to size. To illustrate: careful measurements have been made of Wilkesbarre anthracite, a fine quality of hard coal, with the following results:

Size of coal.

Cubic feet in ton of 2,240 lbs.

Cubic feet in ton of 2,000 lbs.

Lump................................

33.2

22.8

Broken........................

33.9

30.3

Egg.................

34.5

30.8

Stone.....................

34.8

31.1

Chestnut.....................

35.7

31.9

Pea.......................

36.7

32.8

For soft coal the following measures may be taken as nearly correct; it is simply impossible to determine any exact rule, even for bituminous Coins, Weights And Measures. 185 coal of the same district: Briar Hill coal, 44.8 cubic feet per ton of 2,240 pounds; Pittsburgh, 47.8; Wilmington, 111., 47; Indiana block coal, 42 to 43 cubic feet.

Measure Of Earth, Etc.

One ton of soil = 18 feet cube.

45 cubic feet of soil = 21/2 tons.

A cubic foot contains 6 gallons and 1 quart of water, weighing 621/2 lbs.

151/2 cubic feet of chalk weighs

1 ton.

18 " " clay "

1 "

21 ' " earth "

1 "

19 " " gravel "

1 "

21 " " sand "

1 "