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OF RADIANT HEAT THROUGH DIFFERENT BODIES.
45
| Names of the interposed substances (common thickness, 2mm·6.) |
Transmissions from 100 rays of heat issuing from | |||
| a Locatelli lamp. | incandescent platina. | blackened copper heated to 390° (732°) | blackened copper heated to 100° (212°) | |
| Rock salt (diaphanous, colourless) | 92 | 92 | 92 | 92 |
| Fluate of lime (diaphanous, colourless) | 78 | 69 | 42 | 33 |
| Rock salt (diaphanous, dull) | 65 | 65 | 65 | 65 |
| Beryl (diaphanous, greenish yellow) | 54 | 23 | 13 | 0 |
| Fluate of lime (diaphanous, greenish) | 46 | 38 | 24 | 20 |
| Iceland spar (diaphanous, colourless) | 39 | 28 | 6 | 0 |
| Another species (diaph., colourless) | 38 | 28 | 5 | 0 |
| Mirror glass (diaphanous, colourless) | 39 | 24 | 6 | 0 |
| Another kind (diaph., colourless) | 38 | 26 | 5 | 0 |
| Rock crystal (diaphanous, colourless) | 38 | 28 | 6 | 0 |
| Rock crystal, smoky (diaph., brownish) | 37 | 28 | 6 | 0 |
| Acid chromate of potash (a vivid orange) | 34 | 28 | 15 | 0 |
| White topaz (diaphanous, colourless) | 33 | 24 | 4 | 0 |
| Carbonate of lead (diaph., colourless) | 32 | 23 | 4 | 0 |
| Sulphate of barytes, pure, (diaphanous, rather dullish) | 24 | 18 | 3 | 0 |
| White agate (translucid, pearly) | 23 | 11 | 2 | 0 |
| Adularia felspar (diaph., dull, veined) | 23 | 19 | 6 | 0 |
| Amethyst (diaphanous, violet) | 21 | 9 | 2 | 0 |
| Amber, artificial (diaph., yellow) | 21 | 5 | 0 | 0 |
| Emerald (diaph. bluish green) | 19 | 13 | 2 | 0 |
| Agate, yellow (translucid, yellow) | 19 | 12 | 2 | 0 |
| Borate of soda (translucid, white) | 18 | 12 | 8 | 0 |
| Green tourmaline (diaph., deep green) | 18 | 16 | 3 | 0 |
| Cowhorn (translucid, hazel) | 18 | 4 | 0 | 0 |
| Common gum (diaph., yellowish) | 18 | 3 | 0 | 0 |
| Sulphate of barytes (diaph., dull veined) | 17 | 11 | 3 | 0 |
| Sulphate of lime (diaph., colourless) | 14 | 5 | 0 | 0 |
| Sardoine (translucid, brown) | 14 | 7 | 2 | 0 |
| Citric acid (diaphanous, colourless) | 11 | 2 | 0 | 0 |
| Carbonate of ammonia (diaphanous, dull, striated) | 12 | 3 | 0 | 0 |
| Tartrate of potash and soda (diaphanous, colourless) | 11 | 3 | 0 | 0 |
| Amber, natural (translucid, yellowish) | 11 | 5 | 0 | 0 |
| Alum (diaphanous, colourless) | 9 | 2 | 0 | 0 |
| Glue, strong (diaph., yellowish brown) | 9 | 2 | 0 | 0 |
| Mother-of-pearl (translucid, white) | 9 | 0 | 0 | 0 |
| Sugar-candy (diaphanous, colourless) | 8 | 0 | 0 | 0 |
| Green fluate of lime (translucid, marbled green) | 8 | 6 | 4 | 3 |
| Melted sugar (diaphanous, yellowish) | 7 | 0 | 0 | 0 |
| Ice very pure (diaphanous, colourless) | 6 | 0 | 0 | 0 |
