urs in his co-believers on this side of the Atlantic: that is, he con- founds the blue-violet rays of the spectrum with blue-violet this space with as equal flames as possible, and in the experi- ments with the candles six were burned atatime. The re- sults of the measurements lay no claim to… … fraction of that produced by combustion, The Photographic News adds that, accord- so that by far the greatest part escaped by ing to Draper and others, all the rays of natural ventilation. the spectrum probably possess photogenic Fig. 3. To compare the relative contamination power on some…
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