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TABLE
Of the Refractive and Dispersive Powers of different Substances, with their Densities compared with that of Water which is taken as the Unit.
The substances marked (*) are combustible.
The refraction is supposed to take place between the given substance and a vacuum.
| Substance. | Ratio of refraction. |
Dispersive power. |
Density. |
| Chromate of lead (strongest) | 2.974 | 0.4 | 5.8 |
| Realgar | 2.549 | 0.267 | 3.4 |
| Chromate of lead (weakest) | 2.503 | 0.262 | 5.8 |
| *Diamond | 2.45 | 0.038 | 3.521 |
| *Sulphur (native) | 2.115 | 2.003 | |
| Carbonate of lead (strongest) | 2.084 | 0.091 | 6.071 |
| weakest | 1.813 | 0.091 | 4.000 |
| Garnet | 1.815 | 0.033 | 3.213 |
| Axinite | 1.735 | 0.030 | |
| Calcareous Spar (strongest) | 1.665 | 0.04 | 2.715 |
| weakest | 1.519 | 2.715 | |
| *Oil of Cassia | 1.641 | 0.139 | |
| Flint glass | 1.616 | 0.048 | 3.329 |
| another kind | 1.590 | ||
| Rock crystal | 1.562 | 0.026 | 2.653 |
| Rock salt | 1.557 | 0.053 | 2.130 |
| Canada basalm | 1.549 | 0.045 | |
| Crown glass | 1.544 | 0.036 | 2.642 |
| Selenite | 1.536 | 0.037 | 2.322 |
| Plate glass | 1.527 | 0.032 | 2.488 |
| Gum arabic | 1.512 | 0.036 | 1.452 |
| *Oil of almonds | 1.483 | 0.917 | |
| *Oil of turpentine | 1.475 | 0.042 | 0.869 |
