The instrument can be calibrated by a continuous current.
The ammeter to be calibrated is placed in series with a suitable low resistance which may be ï¿½i ohm, ï¿½oi ohm, ï¿½ooi ohm or more as the case may be.
- latitude at which it is calibrated should thereEdgewise fore be stated.
The strength of the field is proportional to the swing of the galvanometer-needle, and, when the galvanometer is calibrated, can be expressed in C.G.S.
Hence if the galvanometer is calibrated by a potentiometer we can determine the value of this current in amperes, and knowing the value of n and V thus determine C. Various forms of commutator have been devised for effecting this charge and discharge rapidly by J.
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