Diamond / Scheeffer Type F (DC) Previous
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Unlike the previous models, the first version of the Type F was made mainly for use on DC circuits (but could be used on some AC circuits). This was a typical commutator-type meter but with the internal components arranged so that they could fit the same round enclosure used with the previous Type D and E induction-type meters. The light-load adjusting coil was of the type where it could be slid in or out of the current coil, as was done on the Thomson Recording Wattmeter. Diamond Type F
Scan by Bill Ostrander