. The Americana : a universal reference library, comprising the arts and sciences, literature, history, biograhy, geography, commerce, etc., of the world . Fig. 2. Fig. 3. Marconi Earlier Apparatus in Fig. 3. The Marconi filings coherer as itappears in practice is shown at k. It consistsof a glass tube, suitably upheld, atout long and .1 inch inside diameter. Thefilings, a mixture of 90 per cent nickel and 10per cent silver filings, are inserted in a smallspace between two plugs n. which fit snuglyinto the tube which is exhausted of air. Smallwires extend from these plugs to the out
. The Americana : a universal reference library, comprising the arts and sciences, literature, history, biograhy, geography, commerce, etc., of the world . Fig. 2. Fig. 3. Marconi Earlier Apparatus in Fig. 3. The Marconi filings coherer as itappears in practice is shown at k. It consistsof a glass tube, suitably upheld, atout long and .1 inch inside diameter. Thefilings, a mixture of 90 per cent nickel and 10per cent silver filings, are inserted in a smallspace between two plugs n. which fit snuglyinto the tube which is exhausted of air. Smallwires extend from these plugs to the outsideof the tube. One of these wires is connectedwith the vertical wire A. the other with a wireleading to the earth. Hence the coherer is inseries with the vertical wire. The relay R isin a shunt circuit with a single cell of bat-tery b and the coherer, as shown. The arma-ture lever / of this relay controls the localcircuits of the electric bell T and an ink re-cording register E. which are operated by localbattery b of 4 or 6 cells. The actual transmission of messages iseffected by means of key K, Fig. 2. Each timethe key is closed the vibrator a s
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Keywords: ., bookcentury1900, bookdecade1900, bookidamericanauni, bookyear1903
