rbonic violet-colored rays; but it would not trans- acid actually found in the air of this ex- mit one single violet ray more than the perimental chamber was only a small other window. fraction of that produced by combustion, The Photographic News adds that, accord- so that by far the greatest part… … glass can enable the photographer to ob- If we regard the photometric effect of the flames during the experiments, it showed that with equal il- tain more rapid or effective results.” lumination rape oil and gas increase the temperature much 4-9 STONE SAWS. Tue ‘‘London” cement for joining broken…
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