magnetograph

noun
mag·​ne·​to·​graph | \ mag-ˈnē-tō-ˌgraf How to pronounce magnetograph (audio) \

Definition of magnetograph

: an automatic instrument for recording measurements of a magnetic field (as of the earth or the sun)

First Known Use of magnetograph

1847, in the meaning defined above

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The first known use of magnetograph was in 1847

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