we have
D = √([200(2 + 1½)2]
0.7854)4
3,
Now 1 + 1½ = 5
2 and (5
2)2 is 25
4,
also, 200 × 25
4 = 1250,
1250 × 4
3 = 1666,
1666 ÷ 0.7854 = 2121,
finally, √2121 = 446 very nearly.
C.
WEIGHTS AND MEASURES.
| Name of material. | Weight per cubic foot. | |
|---|---|---|
| Air | 0.077 lbs. | |
| Earth | 112. lbs. | |
| Water | 62.5 lbs. | |
| Ice | 58.0 lbs. | |
| Sand | 132.0 lbs. | |
| Clay | 120.0 lbs. | |
| Chalk | 155.0 lbs. | |
| Brick | 110.0 lbs. | See Chap. XI., masonry. |
| Brickwork | 95.0 lbs. | |
| Dry mortar | 96.0 lbs. | |
| Sandstone | 140.0 lbs. | |
| Limestone | 142.0 lbs. | Average 86 to 198. |
| Granite | 175.0 lbs. | |
| Coal, Bituminous | 60 to 80.0 lbs. | |
| Coal, Anthracite | 85 to 95.0 lbs. | |
| Coke | 50 to 65.0 lbs. | |
| Coal, Cannel | 75 to 80.0 lbs. | |
| Wrought Iron | 480.0 lbs. | |
| Cast-Iron | 450.0 lbs. | |
| Steel | 487.0 lbs. | |
| Hard Wood. | ||
| Green | 62.0 lbs. | |
| Air dried | 46.0 lbs. | |
| Kiln dried | 40.0 lbs. | |
| Soft Wood. | ||
| Green | 53.0 lbs. | |
| Air dried | 30.0 lbs. | |
| Kiln dried | 28.0 lbs. | |
| Weight per bushel. | ||
| Wheat | 60 lbs. | |
| Corn on the cob | 70 lbs. | |
| Corn, shelled | 56 lbs. | |
| Rye | 56 lbs. | |
| Oats | 35 lbs. | |
| Barley | 47 lbs. | |
| Potatoes, Irish | 60 lbs. | |
| Potatoes, Sweet | 55 lbs. | |
| Beans, White | 60 lbs. | |
| Beans, Castor | 46 lbs. | |
| Bran | 20 lbs. | |
| Clover Seed | 60 lbs. | |
| Timothy | 45 lbs. | |
| Hemp | 44 lbs. | |
| Flax | 56 lbs. | |
| Buckwheat | 52 lbs. | |
| Peaches, Dried | 33 lbs. | |
| Apples, Dried | 24 lbs. | |
| Onions | 57 lbs. | |
| Salt, Coarse | 50 lbs. | |
| Malt | 38 lbs. | |
| Corn Meal | 48 lbs. | |
| Salt, Fine | 55 lbs. | |