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Updated: October 4, 2026
One of the principal difficulties of the method at present is the time ordinarily required to obtain a good picture. Usually this time may be stated at in the neighborhood of an hour, though many good skiagraphs have been taken in a half hour or twenty minutes. It is stated that Messrs. McLeennan, Wright, and Keele of Toronto have reduced the necessary time to one second, and that Mr.