Ship's log and speedometer

Details Ship's log and speedometer Ship's log and speedometer

1978-05-15

1979-07-03

Woodiel, Donald O.

Measuring and testing

Navigation

Ship's log

324167, G01C 2110

Patent

active

041596447

ABSTRACT:
My invention relates to ship'logs and speedometers, comprising magnetometers and associated circuitry located inside the hull of the vessel, for accurately sensing, indicating, and recording the revolutions of an external rotator equipped with a small permanent magnet assembly. The rotator with a low-friction bearing arrangement is suitably located outside and below the hull of the vessel so that its rotation accurately registers the movement of the vessel through the water. The elimination of any mechanical or electrical connection between the rotator and the inside sensing components of the magnetometer assembly facilitates removal of the rotator for maintenance and substantially reduces the risk of leaks through the hull of the vessel.

REFERENCES:
patent: 3287969 (1966-11-01), Hardy
patent: 3636767 (1972-01-01), Duffy

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