... world. There are two forty-cell galvanic batteries with switch boards for controlling the voltage, or force, from the whole power to one-fortieth of this amount, at the will of the physician. Safe-guards in the shape of milli-ampere meters continually indicate to the operator the force of the current. There is a dynamo for charging the storage batteries, which may be used in a patient's room when this method is found more convenient or more comfortable for the invalid. There are two static or ... — The People's Common Sense Medical Adviser in Plain English • R. V. Pierce
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