File:Block instrument circuit (Rankin Kennedy, Electrical Installations, Vol V, 1903).jpg
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![File:Block instrument circuit (Rankin Kennedy, Electrical Installations, Vol V, 1903).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/0/0d/Block_instrument_circuit_%28Rankin_Kennedy%2C_Electrical_Installations%2C_Vol_V%2C_1903%29.jpg/549px-Block_instrument_circuit_%28Rankin_Kennedy%2C_Electrical_Installations%2C_Vol_V%2C_1903%29.jpg?20100318180313)
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