Definitions for magnetograph
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Wiktionary
magnetograph(Noun)
A instrument for measuring changes in the direction and intensity of magnetic fields
Webster Dictionary
Magnetograph(noun)
an automatic instrument for registering, by photography or otherwise, the states and variations of any of the terrestrial magnetic elements
The Standard Electrical Dictionary
Magnetograph
An apparatus for recording variations in magnetic elements. One type includes a magnetic needle to which a concave mirror is attached. The light ray from the mirror is reflected upon sensitized paper where its movements are photographically reproduced. The movements of the spot are due to the movements of the needle and act as the record of the same.
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"magnetograph." Definitions.net. STANDS4 LLC, 2013. Web. 20 May 2013. <http://www.definitions.net/definition/magnetograph>.