. Induction coils : how to make, use, and repair them including Ruhmkorff, Tesla, and medical coils, Roentgen radiography, wireless telegraphy, and practical information on primary and secondary battery . paper, then a sheet of foil in its centre,then another paper and another foil sheet,and so on. There is to be no connectionfrom sheet to sheet, only the inductiveaction of one on its neighbor. The foilmust be considerably smaller than thepaper in this construction, owing to thegreater tendency to discharge round theedges of the sheets, owing to the greaterpotential of the current. When the re
. Induction coils : how to make, use, and repair them including Ruhmkorff, Tesla, and medical coils, Roentgen radiography, wireless telegraphy, and practical information on primary and secondary battery . paper, then a sheet of foil in its centre,then another paper and another foil sheet,and so on. There is to be no connectionfrom sheet to sheet, only the inductiveaction of one on its neighbor. The foilmust be considerably smaller than thepaper in this construction, owing to thegreater tendency to discharge round theedges of the sheets, owing to the greaterpotential of the current. When the requisite number of sheetshave been built up, leave a sheet of foil topand bottom for connection, tie betweentwo pieces of stout card or board, and im-merse in the molten paraffin. When thor-oughly soaked, remove and put underpressure until cold. It will be found un-desirable to make these with more than adozen pairs of sheets, but to make a num-ber of blocks of that number for readyservice. Fig. 32 shows the arrangement of theapparatus to charge a Leyden jar, theplate form being connected in a similar no Condensers. manner. The jar is stood upon an insulat-ing support—a dry tumbler will answer—. Fig. 32. with the ball ^ connected to one pole ofthe coil. From the outside tinfoil coating Condensers. Ill T a wire runs to the discharger D Dy whichis in circuit with the secondary coil, discharger balls D D are carefully ap-proximated until the spark just passes, thislatter point being of great the discharger balls too near thespark would probably pierce the dielectricof the condenser, therefore the balls shouldbe carefully brought near to each otheruntil the exact distance is found. Even ifthe insulation of the condenser were notpierced, yet a path would probably beopened through which some succeedingdischarge would pass, and ruin the instru-ment. Another method of charging is to leavean air gap at B; then there is not muchliability of the condenser discharg
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