Measurement and Instrumentation
Some wire- wound resistors have bifilar winding. This type of winding is used to

Increase the thermal stability
Reduce the tolerance
Double the power rating of the resistor
Reduce the inductance of winding

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Measurement and Instrumentation
In DC potentiometer measurments, a second reading is often taken after reversing the polarities of the DC supply and the unknown voltage and the average of the two reading is taken. This is with a view of eliminate the effects of

 Ripples of the DC supply.
 Errorneous standardisation.
  Stray thermal emfs.
 Stray magnetic fields.

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