negative picture drops from its inclined magazine down a vertical or is soon visible. The exposure has to last in the case of performs both operations simultaneously, and at a nearly vertical chute to the point of assembling. The speed equal to that of a typewriter. One but ordinar- glass negatives… … A New Gas Detector, Zacharias, both manufacturers Spongy platinum, as is well of double opera glasses at Mid- known, glows in a mixture of delburg, Holland. combustible gas and air; but The year 1890 therefore corre- hitherto no convenient arrangement has been devised the former machine, to bring…
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