Page:Scientific Memoirs, Vol. 1 (1837).djvu/41

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OF RADIANT HEAT THROUGH DIFFERENT BODIES.
29
Table II.—continued.
Deviations of
the galvanometer,
Rays
transmitted.
°
Nitric acid (pure and colourless)  5·36 15
Alcohol (absolute and colourless)  5·30 15
Hydrate of potassium (colourless)  4·63 13
Acetic acid (rectified, colourless)  4·25 12
Pyroligneous acid (of a slightly brownish colour)  4·28 12
Sugared water [eau sucrée] (colourless)  4·20 12
Alum water (colourless)  4·16 12
Salt water (colourless)[1]  4·15 12
White of eggs (slightly yellowish)  4·00 11
Distilled water  3·80 11


Table III.Crystallized bodies. Common thickness 2ᵐᵐ·62.
Deviations of
the galvanometer,
Rays
transmitted.
°
Mirror-glass 21·60 62
Rock salt (diaphanous) 28·46 92
Iceland spar (diaphanous) 21·80 62
Another species (diaphanous) 21·30 61
Rock crystal, colourless (diaphanous) 21·64 62
Rock crystal, smoky (diaphanous and very decidedly brown) 20·25 57
Brazil topaz, colourless (diaphanous) 19·18 54
Carbonate of lead (diaphanous) 18·35 52
White agate (translucid) 12·48 35
Sulphate of barytes (veined, dully diaphanous) 11·72 33
Emerald (diaphanous, of a light blue) 10·16 29
Yellow agate (translucid, yellow) 10·10 29
Borate of soda (translucid)  9·87 28
Green tourmaline (diaphanous, green)  9·54 27
Adularia (diaphanous, dull, veined)  8·30 24
Sulphate of lime (diaphanous)  7·15 20
Fluate of lime (diaphanous, dull, veined)  5·40 15
Citric acid (diaphanous)  5·15 15
Sardoine (translucid)  4·98 14
Carbonate of ammonia (diaphanous, dull, striated)  4·50 13
Tartrate of potash and soda (diaphanous)  4·40 12
Alum, crystal (diaphanous)  4·36 12
Sulphate of copper (strongly diaphanous, blue)  0·00  0
  1. In this solution we used very diaphanous pieces of rock salt; the same may be said of the solution immediately preceding—the water was completely saturated with the alum.