ph; and the necessity the rotating receiving-cylinder. Since the same in- the recording pair, where it is firmly held, owing ‘to its of employing a chemically-treated paper is obviated. strument can be used whether for transmitting or increased distance from the opposing pair. On break- The… … half-tone, an insulating material is filled. Thus cuit once during each rotation of the cylinder. The Fig. 2.—PORTRAIT OF PRESIDENT LOW, TRANS- treated, the zinc sheet presents a fairly smooth, par- fast cylinder stops, and starts immediately upon clos- MITTED BY THE ELECTROGRAPH. (Reduced.) tially…
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