Form G-2, Form GG-4, and Type G-3 DC switchboard meters (1898-1930s?) Previous
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After the Form G switchboard meter was introduced, an improved version known as the Form G-2 was introduced. The rectangular form fit better to the switchboard than the previous round case and the brake magnets and disk were now shielded against stray fields present on the switchboard. This model was built in both 2- and 3-wire versions and in a succession of models, each one being an improvement: Form G-2, Forms GG-2 through GG-4, and finally Types G through G-3. All these models were built in self-contained capacities from 2000 amps to a whopping 10,000 amps!
 
Form G-2
GE TRW handbook
Form GG-4
Electrical Meterman's Handbook