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Using magnesium light for photographic purposes 
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The Chemical News and Journal of Physical Science, 1864, Vol.IX, p.128, Ordinary Meeting of the Manchester Literary and Philosophical Society, February, 9, 1864.
Professor Roscoe stated that great credit was due to Mr. Sondstadt for the able manner in which he had brought the difficult subject of the metallurgy of magnesium into the present satisfactory position, and expressed his opinion that, even for photographic purposes, the application of the metal will prove most important. Mr. Brothers, Mr. Parry, and other photographers present, corroborated Dr. Roscoe's opinion respecting the value of such a source of light for photography. Since the meeting Mr. Brothers made an experiment upon the magnesium light, which he reports as follows : "The result of an experiment I have just tried is, that in fifty seconds with the magnesium light I have obtained a good negative copy of an engraving the copy being made in a darkened room. Another copy was made in the usual way in daylight, and in fifty seconds the result was about equal to the negative taken by the artificial light. The sun was shining, but there was a good deal of fog in the atmosphere." 

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