. Dental electro-therapeutics. his is aclosed-circuit transformer and a much more efficient ma-chine than the induction coil. It consists of an iron core,which is the electro-magnet, a primary coil through whichcirculates the alternating current and a secondary coilwhich is in the magnetic field and is not wound around theprimary but around a different part of the magnet, andreceives the induced current. The E. M. F. induced inthe secondary coil can be regulated by the turns in thecoil in ratio to those in the primary as has been explainedelsewhere. Transformers for alternating currents areesp
. Dental electro-therapeutics. his is aclosed-circuit transformer and a much more efficient ma-chine than the induction coil. It consists of an iron core,which is the electro-magnet, a primary coil through whichcirculates the alternating current and a secondary coilwhich is in the magnetic field and is not wound around theprimary but around a different part of the magnet, andreceives the induced current. The E. M. F. induced inthe secondary coil can be regulated by the turns in thecoil in ratio to those in the primary as has been explainedelsewhere. Transformers for alternating currents areespecially useful for cautery, mouth lamps, hot air, rootdriers, or syringe. 94 ELECTRO-PHYSICS The principle, as explained, of reducing the volts andincreasing the amperes places the current for these pur-poses entirely in control. By placing a regulating rheostatin the secondary circuit the current which has been trans-formed may be regulated to suit the kind of cautery orlamp or other instrument which it is proposed to use, by. Transformer. varying the resistance. The rheostat can be regulated toheat a cautery loop requiring 2 amperes or be adjusted toincrease the current materially to heat a much larger are also used for converting the alter-nating current into high voltage and small amperage forhigh-frequency appliances. They are especially adaptedfor this purpose, for the current being alternating, can be BATTERIES 95 used from the main without interrupters. For z-ray workan alternating current when transformed must be madeunidirectional before it can be used in the tubes. BATTERIES. The construction of galvanic cells, their chemical actionduring the production of current, and the methods of con-necting them to obtain various current strength has alreadybeen described. It has been pointed out that Leclanchecells are the most practical and most lasting form of volticcell, because no change takes place within the cell whenthe circuit is open. There are many f
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