. An elementary manual of radiotelegraphy and radiotelephony for students and operators . itesilk. The secondary circuit is wound in a very large number offlat coils or sections, several hundred such coils being sometimesemployed. These are prepared by winding the silk-covered copper DAAfPED ELECTRIC OSCILLATIONS 43 wire between paper discs in a flat 8j)ii!il, Jis a sailor winds up aspare rope. These coils are then slipped on io the ebonite tubeenclosing the primary coil, and the ends of the coils are then jointedtogether. To enable this to be done, the coil sections are woundin double flat la
. An elementary manual of radiotelegraphy and radiotelephony for students and operators . itesilk. The secondary circuit is wound in a very large number offlat coils or sections, several hundred such coils being sometimesemployed. These are prepared by winding the silk-covered copper DAAfPED ELECTRIC OSCILLATIONS 43 wire between paper discs in a flat 8j)ii!il, Jis a sailor winds up aspare rope. These coils are then slipped on io the ebonite tubeenclosing the primary coil, and the ends of the coils are then jointedtogether. To enable this to be done, the coil sections are woundin double flat layers with a disc of paraflined ]taper between, thebeginning ami end of the wire thus being at the outside, and thetwo layers so wound that the windings follow on in the samedirection. There is then no ditticulty in making the jointsbetween the various flat coils composing the secondary Leslie Miller has, however, invented an ingenious machine forwinding the flat disc coils consecutively with no joints betweenthem at all, as shown in Fig. 5, in which, however, the discs are. Fig. 5. shown widely separated for the sake of clearness. The object ofthis mode of winding is to secure that no two points on thesecondary wure which are at great differences of potential comenear to each other. The whole of the very numerous flat coilsforming the secondary circuit are compressed together betweenthe two thick ebonite cheeks, and it is usual to immerse the wholefinished secondary coil in very hot melted paraffin wax to excludeair and insulate it thoroughly. The coil so made is finished byenclosing in an outer sheath of thin ebonite and mounting it on abox baseboard on supports of ebonite. The ends of the secondarywire are brought to two terminals carried on ebonite pillars andprovided with adjustable spark points (see Fig. 6). Two otheradjuncts are then necessary. In the first place some means has tobe provided for rapidly interrupting or reversing the primai-y 44 RADIOTELEGRAPHY
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1916
