The stereoscope and stereoscopic photography (1890)
Drouin, F. (Felix) · Bradford ; London : Percy Lund, The Country Press · leaf 164
Fig. ioo. Magnesium being generally used, we will,however, remark that the instruments in which ametallic powder is blown into a flame, cannot beused for instantaneous work, though they are themost convenient arrangements for ordinaryexposures. The result of Dr. Eders experimentsdemonstrates the… … AND STEREOSCOPIC PHOTOGRAPHY. 159 produced has at least a duration of a third or aquarter of a second ; whilst special mixtures (inwhich magnesium is mixed with a combustiblesuch as chlorate of potash) have for their durationonly -q1^ part of a second. In spite of the precautions necessary in…
Stereoscope · Photography, Stereoscopic
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