. The Americana : a universal reference library, comprising the arts and sciences, literature, history, biograhy, geography, commerce, etc., of the world . s of this system is in-dicated in Figs. 15, 16. C. C are the capacityareas. T is an induction coil, or inductor, ofpeculiar construction, the primary of which hasfour turns of heavy wire; the secondary wirehas forty turns of somewhat smaller wire,wound outside of the primary. This inductor isimmersed in oil in a suitable containing is designed to have low inductance and asmall time constant. The primary p supplies in-ductance to t
. The Americana : a universal reference library, comprising the arts and sciences, literature, history, biograhy, geography, commerce, etc., of the world . s of this system is in-dicated in Figs. 15, 16. C. C are the capacityareas. T is an induction coil, or inductor, ofpeculiar construction, the primary of which hasfour turns of heavy wire; the secondary wirehas forty turns of somewhat smaller wire,wound outside of the primary. This inductor isimmersed in oil in a suitable containing is designed to have low inductance and asmall time constant. The primary p supplies in-ductance to the oscillating closed circuit />, r. , this circuit being tuned by varying the ca-pacity of Leyden jars c c. S is the usual spark-gap. / is an induction coil provided with aWehnelt electrolytic interrupter W. Key Kis a telegraph key of heavy construction,capable of breaking currents of 50 amperes inthe primary circuit of the induction coil. Toprevent excessive sparking and to hasten theinterruptions at the contact points of the key amagnetic blow-out is employed. In Fig. 16 itmay be seen the conditions at the vertical wire WIRELESS The Brami Wireless Telegr;ipli Station at Heligoland. TELEGRAPHY, WIRELESS are virtually reversed as cnnipared with the ar-rangement in the transmitting circuit; the ver-tical wire A and condensers c, c. and primarywire of a small transformer 7, forming an oscil-lating circuit; the feeble received oscillations OE>p If I ^ W Fig. 15. Fig. 16. Braun Transmitting and Receiving Circuits. being thereby transformed to higher potentialsin the secondary oscillatory circuit s, in which isthe coherer /.. One terminal of the coil s is con-nected to the coherer, the other terminal isconnected to a loose coiled wire s. Tlie ver-tical wire circuits and the oscillatory circuitsare, in this system, also tuned to a correspondingrate of oscillations. /? is a sensitive polarizedrelay, controlled by the detector k. The Braundetector is a filings co
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Keywords: ., bookcentury1900, bookdecade1900, bookidamericanauni, bookyear1903
