The Galvanometer: A Series of Lectures (Classic Reprint) - Softcover

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Excerpt from The Galvanometer<br/><br/>For purposes of absolute measurement the coils of the galvanometer must be of known dimensions, they must be at a known distance from the needle, and the latter must be situated in a magnetic field of known intensity. The simplest form, which is also that most frequently met with in practice, consists of one or more circular coils mounted vertically in the magnetic meri dian. Where a single coil is used the needle is in its axis. When there is more than one coil, these have a common axis in which the needle hangs.

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