Measuring and testing – Liquid level or depth gauge – With other measuring device
Patent
1996-10-20
1998-11-10
Bennett, G. Bradley
Measuring and testing
Liquid level or depth gauge
With other measuring device
73300, 374143, 374136, 43 4, G01F 2314
Patent
active
058346414
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a depth gauge for use in angling and sports fishing. It is used to measure the depth of a body of water from its surface to its bottom, or the depth of strata of water of different temperatures within a body of water.
2. The Prior Art
A digital depth gauge with a piezoresistive pressure recording (Druckaufnahme), integral illumination and zero point correction is known for diving in mountain lakes having depths up to 200 m (German patent specification 31 45 158 A1).
Owing to its structure, its size and its weight, as well as, in particular, its elaborate set-up, this apparatus is unsuitable for anglers and sports fishermen.
Also an apparatus is known for detecting the profile of the bottom of waters which in essence consists of a pressure measuring capsule adapted to be moved by a line on the bottom of the water in direct contact therewith, the measured values of which are continuously transmitted to an interpreting station by a connection (German utility model 76 05 605.8). This apparatus is utilized particularly in the preparation of aqueous construction operations and is unsuitable in sports fishery.
For angling and sports fishing, species-specific bait has to be offered to a fish in its respective environment, for which purpose the depth of the water has to be correctly determined by the angler or sports fisherman. At present, this is done by repeatedly sinking and retrieving a ground lead (sinker) on a fishing line and a quill spaced therefrom, and by resetting the distance between sinker and quill until the distance between the bottom of the water and the surface of the water is recognizable by the position of the quill. This is a tedious and time-consuming procedure which because of the frequent casting of the sinker may lead to fish being chased away.
It is known that in almost all bodies of waters there are strata or currents of cold and warm water. At the interfacial zones of such layers of water, i.e. at those positions at which the cold and warm water strata converge, there exist temperature differences of several degrees Kelvin. Such strata are known to anglers and sports fishermen as thermoclines. These thermoclines are of particular importance to the angler or sports fisherman because it is these strata which are often frequented by predatory fish. Therefore, the angler and sports fisherman favors placing his bait as precisely as possible at or in these thermoclines.
Unless the very elaborate procedure for determining these thermoclines is wholly dispensed with and angling is to be undertaken on the basis of "pure luck", this thermocline can only be fathomed with a thermometer. This is done by systematically and frequently placing a thermometer at different depths of the water, and retrieving it for reading, until the approximate depth of the searched-for thermoclines has been determined an the basis of a predetermined discontinuity in temperature.
The use of a known thermometer for this purpose is disadvantageous because of the disproportionately elaborate effort, which is why anglers and sports fishermen usually dispense with determining thermoclines in the waters. In the event, the manipulation of a thermometer for fathoming thermoclines is only possible from a boat, so that from the land the angler has no possibility whatever for detecting thermoclines.
OBJECTS OF THE INVENTION
It is an object of the invention to provide a depth gauge for anglers and sports fishermen which is useful for measuring the depth of a body of water from the surface thereof to its bottom and/or for detecting the depths of layers of water of different temperatures, and which is simple and handy, which delivers reliable measurement values in the range of relatively shallow depths of water, and which may be manufactured with little investment in a cost efficient manner.
SUMMARY OF THE INVENTION
In accordance with the invention the object is accomplished by arranging, within a water-proof housing, at least an electrical pressure se
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Bennett G. Bradley
Hormann Karl
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