Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-09-20
1978-06-06
Tokar, M.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
335298, G01R 3308
Patent
active
040939120
ABSTRACT:
A nuclear magnetic resonance (NMR) magnet assembly includes two pole faces spaced to provide a gap in which is established a uniform magnetic field. The pole pieces have pole faces that are flat and parallel. The pole pieces are mounted on support plates one of which is fixed and the other of which is movable about a pivot point with two degrees of freedom of movement in response to adjustment of two adjustable mechanisms. Each adjustment mechanism includes a differential screw that produces a transverse movement and a longitudinally inclined pin or pins that translates such transverse movement into a much greatly reduced longitudinal movement. The combination of a differential screw and inclined pin provides a very fine adjustment of the parallelism of the pole faces. Each mechanism further includes means for providing a coarse adjustment.
REFERENCES:
patent: 3588230 (1971-06-01), Rieux
patent: 3611223 (1971-08-01), Utsumi
Double Glen P.
Kahwaty Vincent N.
Randall James D.
Reinhart Fritz M.
International Business Machines - Corporation
McKechnie Douglas R.
Tokar M.
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