6 calories (constant volume) and 345.8 (constant
pressure); for its heat of formation he deduces a value -7.8, and
experimentally found one of about -10.6 (constant pressure).
THE ACETYLENE FLAME.--It has been stated in Chapter I. that acetylene
burnt in self-luminous burners gives a whiter light than that afforded by
any other artificial illuminant, because the proportion of the various
spectrum colours in the light most nearly resembles the corresponding
proportion found in the direct rays of the sun. Calling the amount of
monochromatic light belonging to each of the five main spectrum colours
present in the sun's rays unity in succession, and comparing the amount
with that present in the light obtained from electricity, coal-gas, and
acetylene, Muensterberg has given the following table for the composition
of the several lights mentioned:
______________________________________________________________________
| | | | | |
| | Electricity | Coal-Gas | Acetylene | |
| |________________|__________________|_______________|_______|
| Colour | | | | | | | |
| in | | | | | | With | |
| Spectrum.
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