The action of the device is briefly as follows:
Owing to the direct current in the magnetizing coils C and C' one end of SB will be permanently of north and the other of south polarity; and since the polarities of the poles E and E' will alternate with the alternations of the transformer secondary current, SB will rock rapidly on its pivot, and contact will be made by turns with CS and CS'.
The purpose of the condensers K and K' is to reduce the sparking at these points. When contact is made at CS, the direct current terminals T and T' are connected to the S half of the secondary winding; and when contact is made at CS', they are connected to the S' half. Thus a rectified uni-directional current will flow from T and T', and it may be used to charge the battery A', work a small motor or for various other purposes requiring direct current.
When the rectifier is used for charging storage batteries, the separate cell A may sometimes be dispensed with, the winding C,C' being connected to one of the cells under charge.
The rectifier is adjusted to suit the frequency of the supply circuit by altering the distance of the poles of E and E' from the ends of the polarized armature SB; and also by changing the tension of SP, SP by means of the screw studs against which they bear.
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