A sensitive form of moving-magnet galvanometer in which any effects of the earth’s magnetic field are cancelled out. Two small oppositely directed magnets are suspended at the centres of two oppositely wound coils. As its resultant moment on the magnets is zero, the earth’s field has no effect and the only restoring torque on the magnets is that provided by the suspending fibre. This makes a sensitive but delicate instrument.
A very sensitive type of galvanometer that is a moving-magnet instrument. It has two magnetic needles, NS and N′S′, made as nearly equal as possible and suspended on the same axis in opposition. When the magnets are deflected from their stable point the restoring couples on them due to the earth’s magnetic field act in opposite directions with a very small resultant couple.
Astatic galvanometer
- densitometer
- density
- density current
- density-dependent factor
- density dependent factors
- density determination
- density estimation
- density function
- density functional theory
- density-functional theory
- density gradient
- density-independent factor
- density log
- density of states
- density parameter
- density wave
- density–depth profile
- dental caries
- dental formula
- dentary
- denticle
- dentine
- dentition
- denudation
- denudation chronology