. Dental electro-therapeutics. Fig. 38.—Voltmeter. Amperemeters and voltmeters are also constructed onthe same principle as the dArsonval type milliampere-meter, and are used in measuring strong currents such ascurrent from a small dynamo used for charging accumulatorbattery, and also for testing the voltage of the cells andbatteries, or the current passing from a switchboard forionic medications. Rheostats.—In addition to the current collector it isnecessary in most dental operations to have a finer gradu-ated scale for the increase of the current strength; the RHEOSTATS 103 switching on of o
. Dental electro-therapeutics. Fig. 38.—Voltmeter. Amperemeters and voltmeters are also constructed onthe same principle as the dArsonval type milliampere-meter, and are used in measuring strong currents such ascurrent from a small dynamo used for charging accumulatorbattery, and also for testing the voltage of the cells andbatteries, or the current passing from a switchboard forionic medications. Rheostats.—In addition to the current collector it isnecessary in most dental operations to have a finer gradu-ated scale for the increase of the current strength; the RHEOSTATS 103 switching on of one cell at a time, each cell of volts,increases the current strength too suddenly in operating. P ®- Fig. 39.—Graphite rheostat.
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