The balance described in Part I of this paper was found to be quite suitable for measuring the magnetisation of most substances. The experimental arrangement, by which it was used for measuring magnetisation in strong magnetic fields, is shown in fig. 4. A thin-walled quartz or glass tube (19) is suspended below the diaphragm (4) of the balance; the tube is divided into two parts by a small neck, the top part being filled with the substance to be investigated (20). The lower part of the tube was introduced merely to compensate the magnetic force which acts on the top part; in this way the corrections due to the magnetic properties of the suspension were reduced to a minimum. If the substance (20) was diamagnetic it was placed below the centre of the coil; if paramagnetic it was placed above the centre; thus the force to be measured by the balance always acts downwards. This is necessary as in most cases, even with weakly diamagnetic substances, the force was larger than the weight of the glass tube with the substance.
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Piotr Leonidovich Kapitza (1931) studied this question.