The electro-therapeutic guide, or, A thousand questions asked and answered . re is a primary live wire from a battery, showing a field, the influ-ence of which is exerted from left (-[-)to right (—). Immersed in this field isa secondary wire, insulated from and inno way connected with the first. Tothe ends of this secondary wire we at-tach a meter of the galvanometer type,which is most sensative to slight cur-rents. The needle Of the meter in thissecondary current will be deflected toone side. Mark the direction. Now reverse the primary current directionand immediately the needle of the meter
The electro-therapeutic guide, or, A thousand questions asked and answered . re is a primary live wire from a battery, showing a field, the influ-ence of which is exerted from left (-[-)to right (—). Immersed in this field isa secondary wire, insulated from and inno way connected with the first. Tothe ends of this secondary wire we at-tach a meter of the galvanometer type,which is most sensative to slight cur-rents. The needle Of the meter in thissecondary current will be deflected toone side. Mark the direction. Now reverse the primary current directionand immediately the needle of the meter swings over to the opposite , reversing the primary reverses the secondary. Now connect themeter direct to the primary circuit, with the current flowing in a known di-rection and you will get the deflection just the opposite to what it was whenthe meter was in the secondary circuit, with the primary flowing. The secondary current which is generated in the secondary wire, inthe primary field, is called the indiLced cii7renf and this process is knownas What is meant by electro-magnetic induction? Electro-magnetic induction is a process similar to electric induction, bywhich is generated a magnetic field and lines of force, which influence aconductor immersed in the field, generating an induced current in the par-allel conductor. The combination of the two is known as electro-magneticinduction, and the combination greatly increases the potential of both, andthe combined generator is known as an electro-magnet, and consists of acoil of insulated copper wire wound around an iron rod known as a core,and forms the basis of the induction machine known as the faradic battery. What is meant by hysteresis? Hysteresis is a term applied to rapid magnetization and demagnetiza-tion of a soft iron core lying within a coil of insulated wire, through whichan automatically interrupted galvanic current is passing. 46 THE KLECTRO-THERAPEUTIC GUIDETHE PRIMARY COIL What is a pr
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