Electricity and magnetism : an elementary text-book, theoretical and practical (1920)
Glazebrook, Richard, Sir, 1854-1935 · Cambridge : The University press · leaf 183
3 parallel to the plane of the circle, and when at rest theposition of its ends can be read off on the circle. For thispurpose microscopes are attached to the instrument. Thecircle can turn about a vertical axis and can thus be setin the plane of the magnetic meridian. To use the instrument the… … Fig. 115. On turning the circle then through a right angle the magnetwill swing in the plane of the meridian. Allow it to come torest and read the position on the circle of either end of themagnet; the zero of the circle is adjusted to be in the horizontalplane. Thus if all the adjustments are…
Electricity · Magnetism
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