IP (1903 to 1906) Previous
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With the introduction of the Type I meter, the TRW prepayment gave way to a new model, the Type IP. The two parts of this system were retained, but the Type IP had a standard kilowatthour register instead of the specially-marked register of the prepayment TRW. As with the prepayment TRW, the IP had a contact device that tripped the coil in the prepayment device. The prepayment devices used with the IP were also redesigned. The Form 3 device (center) could be adapted to take either dimes or quarters, while the Form 4 device (right) accepted only quarters.
 
Type I
Electrical Meterman's handbook
Form 3 prepayment
GE prepayment meter pamphlet
Form 4 prepayment
GE prepayment meter pamphlet