Practical electricity .. with questions and answers (1911)
Cleveland armature works, [from old catalog] comp, Lincoln, John C. [from old catalog] · [Cleveland, Ohio, Cleveland armature works] · leaf 226
MPSON REiCORDING WATT METER. Mo&t of tihe recording meters in use in this country areof this type. In general, the meter is simply an ordinarymotor, except that it is built without iron, as sihown inFig. 77. Attached to the shaft of <this motor is a reftardingdisc, which is made of copper… … ( !^ ^ ^ •,<iHi>H Figure 77 Diagram of connections and operation of Thompsons recording wattmeter. and is connected up to a sonall commuitator co-mposed ofsilver bars. Two thin silver brushes touch this comanuta-tor and carry the current to and from the armature. Thetorque on the motor is…
Electricity
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