History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 320
Fig. 86. paper, between, and to connect one piece of the brass with the linewire and one with the earth. The atmospheric electricity, being ofsuch high tension, prefers to pass through the thin sheet of paper,and thus reach an excellent conductor to the earth, rather than ATMOSPHERIC ELECTRICITY.… … Fig. 87. Another plan is to line a small wooden box with sheets of tin,which is then filled with iron filings. The sheets of tin are con-nected with the earth ; and the line wire, after being coveredwith oiled silk, is passed through the iron filings. The atmos-pheric electricity is attracted by…
Telegraph
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