| 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. |