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Show (19) PERMANENCY OF CALIBRATION. Up to this to discuss point it has been the aim of the writer of the some importat underlying principles of the induction wateter. the of theory construction accurate gi ve an meter may- a accurate test the material used in the is poor, the meter may be Such useless. while new matter how perfect no be, if of the meter and, therefore, But meter a and before test short on mine the value ere in of the of the met two main er is not for causes W2.S moving parts to deter service. that produce accurate The increases. herefore, sufficient As the meter operates day verticaJ. a the new meter meter in service that a seryice. of are a might continuous operation has caused deterioration in it. a in inaccuracy when first put in after day the friction moving parts c on s f s c spindle upon which is mounted the disc,· and small gear wheel which drives the mechanism of the integrating ing and, more other ct correct cause The spindle rests upon a jewel bear after things remaining constant, a time energy would be required to drive the spindle at given speed. co r re dial. the this But slow and the other cause running cause due to of friction, the meter to is due to the permanent inaccuracy tends run a to and may more than fast. his latter magnetwhich brings about |
