Speed indicating means
AssigneeDevelopment Finance Corporation of New Zealand
InventorPeter C. J. Parsonage
Life of this patent
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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.
Claims5
A marine speed transducer for mounting in a boat hull, said transducer including a housing having a planar surface along which liquid can flow;
- a magnet having two poles both of which are located adjacent the plane of said surface;
- at least four electrodes in said surface, at least two said electrodes being disposed on each side of one imaginary axis that passes through both said poles;
- two said electrodes being connected together, another two said electrodes being connectable to a detector circuit.
Dependencies are inferred from the claim text.