It is interesting to note the large amount of blue and violet
light in the acetylene flame, for these are the colours which are chiefly
concerned in photography; and it is to their prominence that acetylene
has been found to be so very actinic. It is also interesting to note that
an addition of air to acetylene tends to make the light even more like
that of the sun by reducing the proportion of red and blue rays to nearer
the normal figure.
H. Erdmann has made somewhat similar calculation, comparing the light of
acetylene with that of the Hefner (amyl acetate) lamp, and with coal-gas
consumed in an Argand and an incandescent burner. Consecutively taking
the radiation of the acetylene flame as unity for each of the spectrum
colours, his results are:
__________________________________________________________________
| | | | |
| | | | Coal-Gas |
| Colour in | Wave-Lengths, | |_______________________|
| Spectrum | uu | Hefner Light | | |
| | | | Argand | Incandescent |
|___________|_______________|______________|________|______________|
| | | | | |
| Red | 650 | 1.
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