. The practical telephone handbook and guide to the telephonic exchange . Fig 206. Fig. 407 and to prevent loss by Foucault currents, such iron shouldbe in the form of very fine iron wire, wound at right anglesto the conductor coils, such as shown in Figs. 406 and 407,which show the form of coil suggested by Prof. Pupin,the iron wire being varnished, to prevent side core of such coils may also be built up of very thin ringplates slotted from centre outward. Fig. 407 shows suchplates in section. The coils to be used on aerial lines are usually large,and wound with thicker wire, than
. The practical telephone handbook and guide to the telephonic exchange . Fig 206. Fig. 407 and to prevent loss by Foucault currents, such iron shouldbe in the form of very fine iron wire, wound at right anglesto the conductor coils, such as shown in Figs. 406 and 407,which show the form of coil suggested by Prof. Pupin,the iron wire being varnished, to prevent side core of such coils may also be built up of very thin ringplates slotted from centre outward. Fig. 407 shows suchplates in section. The coils to be used on aerial lines are usually large,and wound with thicker wire, than those intended forcable lines. Results of Loading in America.—Many interesting detailsof the practical results of loading were given in apaper by Dr H. V. Hayes, read before the International 4 H PRACTICAL TELEPHONE HANDBOOK Electrical Congress at St Louis in 1905. A spacing of the coilsat such uniform distances apart on the lines that an electricalwave front passed through 7000 coils per second was found to give good results. This corresponds to -y^y=93 coils per w
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecttelephone, bookyear19
