单词 | photo-magnetograph |
释义 | ˌphoto-magnetograph|-mægˈniːtəgrɑːf| [f. photo- 2 + magnetograph.] An instrument by which records of the fluctuations of the magnetic needle are obtained photographically.
1893Sir R. Ball Story of Sun 228 Facts of magnetic perturbations taken from the photo-magnetographs of the United States Naval Observatory. Ibid. 230 A magnetic storm described as very strong was also recorded by the photomagnetographs. |

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