Speed indicating means

Details Speed indicating means Speed indicating means

1985-08-13

1987-03-31

Goldstein, Herbert

Measuring and testing

Navigation

Ship's log

7386113, 7386115, G01F 158

Patent

active

046533192

ABSTRACT:
A Faraday transducer for a marine speed indicator is sealed in a cylindrical housing so that it can be mounted in a boat hull with its base flush with the hull. A horseshoe magnet sealed within the housing has its poles located against the base surface and with 4 electrodes in the base surface located one on each side of each magnetic pole. The electrodes are connected together in such a way as to cancel out stray magnetic fields and to increase the Faraday emf produced by the relative movement of water flowing across the base of the transducer.

REFERENCES:
patent: 1249530 (1917-12-01), Smith et al.
patent: 3119960 (1964-01-01), Kenyon
patent: 3885433 (1975-05-01), Marsh
patent: 3897684 (1975-08-01), Dewan
patent: 3903741 (1975-09-01), Greene
patent: 4290312 (1981-09-01), Kobayashi
Gray et al., "Electromagnetic Differential Flowmeter" Mar. 1970.

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