Then,—As the whole or absolute weight
is to the loss of weight;
so is the specific gravity of the solid
to the specific gravity of the fluid.
To find the quantities of two ingredients in a given compound.
Take the three differences of every pair of the three specific gravities, namely, the specific gravities of the compound, and each ingredient, and multiply each specific gravity by the difference of the other two:
Then,—As the greatest product
is to the whole weight of the compound;
so is each of the other two products
to the weights of the two ingredients.
To find the diameter of any small sphere, or globule, whose specific gravity is given (or can be found in the Table) and weight known.
Divide its weight in grains by the number expressing its specific gravity; extract the cube root of this quotient, and multiply it by 1·9612 for the diameter.
WEIGHT OF A CUBIC FOOT OF THE FOLLOWING MATERIALS,
in pounds.
| Ash | 49 | Gravel | 120 |
| Beech | 43 | Granite | 166 |
| Birch | 49 | Brick, common | 98 |
| Box | 60 | Chalk | 145 |
| Cork | 15 | Coal, Newcastle | 78 |
| Elm | 36 | Antimony | 418 |
| Fir | 30 | Brass, cast | 525 |
| Mahogany, Spanish | 50 | Copper | 538 |
| Pine, red | 41 | Gold, pure | 1203 |
| Teak | 41 | Iron, cast, variable | 444 |
| Walnut | 41 | Lead | 717 |
| Coke | 46 | Silver, standard | 644 |
| Clay | 125 | Tin | 455 |
| Earth, loose | 95 |
By means of the foregoing table, the weight of any quantity of the materials specified (in cubic feet) may readily be found.