A laboratory manual of electrotherapeutics . urse a vibrator spring,Fig. 35, and a set screw and post which form very essen-tial elements in the action of the induction coil apparatusas will be seen later. A Temporary Magnet.—A soft iron bar or a bun-dle of soft iron wires capable of being readily magnetizedby the passage of the battery current along the primarycoil and again promptly losing its magnetism as this bat-tery current is interrupted, is the part of the inductioncoil apparatus upon which its action chiefly depends. The main purpose of the temporary magnet is tobreak the battery circ
A laboratory manual of electrotherapeutics . urse a vibrator spring,Fig. 35, and a set screw and post which form very essen-tial elements in the action of the induction coil apparatusas will be seen later. A Temporary Magnet.—A soft iron bar or a bun-dle of soft iron wires capable of being readily magnetizedby the passage of the battery current along the primarycoil and again promptly losing its magnetism as this bat-tery current is interrupted, is the part of the inductioncoil apparatus upon which its action chiefly depends. The main purpose of the temporary magnet is tobreak the battery circuit and so interrupt the flow of cur-rent from the battery through the primary coil. This thetemporary magnet does the instant it becomes magnetizedthrough the influence of the current passing in the primarycoil which is wound about it. By its magnetic force itattracts the iron head on the vibrator spring or interrupter,Fig. 35, and draws away the spring from the point ofthe adjusting screw (G) and so leaves a gap (M) in the J d-5 c ? Q. So LABORATORY MANUAL battery circuit. This stops the flow of the battery currentin the primary coil. The soft iron core then loses its mag-netism and releases the head of the vibrator spring whichflies back and is again in contact with the point of theadjusting screw. A second advantage gained by thetemporary magnet, if placed, as it is in many of thesimple forms of induction apparatus within the turns ofthe primary coil, is an augmenting of the inductive effect on the coils by reasonof the magnetic lineso f force emanatingfrom the magnet andcutting the turns ofwire in the primaryI and secondary coils.| In some of the Du-bois-Reymond forms Fig. ?6. Faradic Coil with Dry Cells. of induction coil the temporary magnet is used only to interrupt the circuit ofthe battery current and is placed at a distance from theprimary and secondary coils and so this augmenting in-ducing action upon them is lost. The Circuit-breaker or Interrupter.—The cur-re
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