Abstract
A magnetic balance for the measurement of extensive magnetic fields of 50-10,000 or more gauss is described in which the force acting on a coil of rectangular form carrying a known current is measured with an ordinary physical balance. The sensitivity of the apparatus is such that strong fields may be compared to a few parts in 106 and fields of 10,000 gauss measured in international units to a few parts in 105. The coil consists of ten turns of bare copper wire mounted on a sheet of glass so that its mean width, which is about 16 cm., can be accurately determined. It is shown that the magnetizing effect of the coil on the permanent magnet or electromagnet whose fields are measured can be eliminated. Measurements of less accuracy obtained by a search coil method are also described.
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