History
Early NMR instruments were developed in the 1950s using thermionic valve (vacuum tube) circuits (see for example Scientific American's, Amateur Scientist, by C. L. Stong April, 1959). Sir Peter Mansfield's first acquaintance with NMR was an undergraduate project to develop a transistorized EFNMR spectrometer in the late 1950s . Following that introduction to NMR, he went on to invent an MRI scanner, for which he shared a Nobel prize.
Read more about this topic: Earth's Field NMR
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