An Experiment to Measure the Magnetic Field of the Galaxy: I. Techniques of Measurement

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Abstract
The galactic magnetic field can be measured by investigating the Zeeman splitting of neutral hydrogen spectral features at 21 cm wavelength. Three versions of a basic measurement technique applied to the problem are described and their merits are discussed. Low noise receivers and switches at present available make it possible to extend the measurement of the Zeeman effect to weaker radio sources and to neutral hydrogen emission regions with narrow line widths.