Models R and FR DC switchboard (1911 to the 1930s?) Previous
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The Model R was a shunt-type meter that was similar to the Model E DC meter. There were a few differences including large armature and field coils (astatically wound), gold commutator, and a diamond jewel bearing. This model was offered for use (with shunts) on circuits from 100 to 20,000 amperes, with larger shunts available on request.

The Model FR replaced the Model F meter and consisted of the Model R meter element on the Model F base. This model was offered for circuits from 800 to 20,000 amperes (with appropriate shunts).
No picture of the FR.

Model R
Electrical Meterman's Handbook