Esercizi elementari in fisiologia . hine longitudinalmente di fronte a te sul tavolo con l'interruttore ruotato verso destra. Nel tipo DuBoisReymond i fili sono avvolti in due distinte bobine: il P 84 eoil che è supportato da un montante woodten attaccata alla base dello strumento è composto da relativamente spessa, mentre la S coilmounted su un piede di scorrimento è costituito da filo molto sottile, in thiscase invisibile, in quanto ha un rivestimento protettivo di ebanite. Il parallelismo del filo nelle due bobine è mantenuta come finchéil gli assi delle bobine coincidono. Le spire successive della wir
2889 x 865 px | 24,5 x 7,3 cm | 9,6 x 2,9 inches | 300dpi
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Elementary exercises in physiology . hine lengthwise in front of you on thetable with the interrupter turned to the right. In the DuBoisReymond type the wires are wound into two separate coils: The P 84 eoil which is supported by a woodten upright attached to the base ofthe instrument is composed of relatively thick wire, while the S coilmounted upon a sliding foot is composed of very thin wire, in thiscase invisible, as it has a protective covering of vulcanite. The parallelism of the wire in the two coils is maintained as longas the axes of the coils coincide. The successive turns of the wirein each coil are also practically parallel to each other. The P coilis provided with a core of soft iron wire which magnetizes when aeurreut passes in the surrounding wire, an electro-magnet being thusproduced. The electrical field produced by the coil is greatly intensified bythis core, and the effect on the S coil is correspondingly increased.The nearer the S coil is to the P coil, the more powerful will be theinduction currents.. t Fig. 14, showing the direction of the make and break currents. In the sec-ondary circuit the direction of the break current is shown by the doted line andarrow, and the make by the continuous line. The electromotive force of the currents in the secondary bearsa direct relationship to the primary. Thus, if there are 200 turnsin the P and 6000 in the S, the eletromotive force of the inductioncurrents would be about thirty times as great as the primary, inde-pendently of the influence exerted by the iron core. 289. Connect the Secondary Circuit of the Inductoeium.It is well to do this first in all cases. Fasten a key to the table closeto the left end of the machine as it now rests upon the table, and?connect the binding screws of the S coil with those of the key bymeans of two wires, so that when the key is closed the S circuit isthereby also closed. This is the short circuiting key in the secondarycircuit. Now attach the long circuit wires by means
