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A method of swing on a swing is disclosed, in which a user positioned on a standard swing suspended by two chains from a substantially horizontal tree branch induces side to side motion by pulling alternately on one chain and then the other.
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| Number | Title | Issue Date |
| 4853691 | Method of and apparatus for the acoustic signalling of cases of drowning in swimming pools The invention describes a method and apparatus for the acoustic signalling of cases of drowning in swimming pools, to guarantee reliable trigger of the alarm while avoiding any false alarms. This is effected basically by a switching element (1) in a water... | 08/01/1989 |
| 4832532 | Apparatus for determining liquid/gas interfaces An apparatus for carrying by a diver while underwater that provides information useful for enabling the diver to expeditiously and safely work on submerged vessels without the danger of tapping into an explosive gas. The invention is particularly useful f... | 05/23/1989 |
| 4825424 | Sensing systems A sensing system for sensing acoustic waves, the sensing system comprises one or more sensor elements for use underwater, a reference sensor, and compensation means for compensating noise generated in the sensing system in dependence upon signals provided... | 04/25/1989 |
| 4751690 | Fiber optic interferometric hydrophone A fiber optic interferometric hydrophone is based on the change in optic path length of optic fibers bonded to both sides of a bending beam which acts as an acoustically sensitive diaphragm. The bending beam is segmented into an even number of segments, acoust... | 06/14/1988 |
| 4749254 | Optical sensor system Present electrical expendable oceanographic instruments are vulnerable to insulation leaks and electromagnetic interference; they are also unable to measure pressure and the index of refraction. In response to these difficulties a unique combination of op... | 06/07/1988 |
| 4680584 | Acoustic prelaunch weapon communication system The transmission of prelaunch weapon communication in a submarine is accoished without the use of an umbilical cord. Acoustic transducers transmit and receive acoustic data through water in place of the umbilical cord. The data transmitted through the wa... | 07/14/1987 |
| 4674075 | Cardan suspension for microphones for sound ranging in water A hydrophone comprises a microphone pivotally mounted on each end of a gimballed tube. A coiled cable connects each microphone with a housing for a receiver. A tube having an external diameter equal to the inside diameter of the cable coil is inserted par... | 06/16/1987 |
| 4654010 | Method and apparatus of measuring swimming technique A method and device for measuring swimming technique utilizes a pressure transducer mounted to the hand of a swimmer. A measurement is taken of the pressure differential between the palm and the back of the swimmer's hand is measured during swimming and i... | 03/31/1987 |
| 4649529 | Multi-channel fiber optic sensor system A time division multiplexing, fiber optic data gathering system, including two or more sensors formed on an optical fiber, and a phase sensitive detector. Each sensor includes two reflectors separated by a section of the fiber having length L. Each reflec... | 03/10/1987 |
| 4632213 | Seismic source system for use in water covered area Apparatus for forming a downwardly directed beam of acoustic wave energy in a body of water, comprising a source of acoustic wave energy such as a water gun, supported at a selected depth in the body of water. Means are provided above and around the sourc... | 12/30/1986 |
| 4618024 | Moving seismic source system for use in water-covered areas A moving seismic source system for the use in water-covered areas comprising a conventional source and streamer cable means with multiple receiver, and additionally includes between the source and receivers a volume of the body of water containing a small... | 10/21/1986 |
| 4599711 | Multi-lever miniature fiber optic transducer An improved bifurcated multi-lever fiber optic transducer comprising one ht transmitting fiber and two receive fibers having different core diameters separated at one end and combined at the common distal end in the vicinity of a reflective surface paral... | 07/08/1986 |
| 4514834 | Expendable underwater acoustic projector An expendable sound source provides a cost effective projection of acoustic nergies in the ocean. A tubular housing contains a d.c. motor that locates its shaft coaxial with the housing. Cylindrically-shaped camming blocks engage spurs in a pair of rigid p... | 04/30/1985 |
| 4472794 | Sleeve shuttle air gun A sleeve shuttle air gun is described which can be fired by a solenoid valve without dumping compressed air into the ambient prior to firing, thereby avoiding the generation of premature impulses caused by such dumping and avoiding the heavy duty complex ... | 09/18/1984 |
| 4446543 | Optical resonator single-mode fiber hydrophone A hydrophone remotely senses impinging acoustic energy. Light output from a laser is split and launched into a single-mode fiber which transmits it to an optical resonator at its end. The resonator is made up of a fixed fiber end having a dielectric coati... | 05/01/1984 |
| 4376302 | Piezoelectric polymer hydrophone A piezoelectric polymer hydrophone including a single flexible sheet of a ezoelectric polymer having a plurality of electrode strips on the top and bottom of the sheet. The electrode strips at the top are staggered by one half the width of a strip relativ... | 03/08/1983 |
| 4363533 | Concentric fiber optical transducer An optical transducer (10) having a plurality of concentric cores (15,17). An intermediate cladding (16) is disposed between the inner and outer cores and an outer cladding (18) surrounds the outer core to define a symmetrical cylindrical transducer struc... | 12/14/1982 |
| 4361879 | Ferrofluid transducer An underwater sound generator composed of a ferrofluid contained within a toroidal container which has a rigid bottom and top and elastic cylindrical side walls. A coil of wire links the toroidal container and is adapted to be connected to a dc bias sourc... | 11/30/1982 |
| 4308603 | Ferrofluid transducer A magnetic fluid transducer for producing a low-frequency sound field in a fluid medium. The device comprises a non-magnetic cylindrical housing with end windows. The housing is surrounded by a magnetic-field-generator means and contains a magnetic fluid ... | 12/29/1981 |
| 4022055 | Pulse-echo method and system for testing wall thicknesses A method and system for improving the pulse-echo type of testing to determine wall thicknesses. It is particularly applicable to pipes. There is a pulse directed transversely to the wall so that reflections from the inner and outer surfaces will indicate ... | 05/10/1977 |
| 3990035 | Housing configuration for high resolution sonar A hydrodynamically streamlined, towable sonar apparatus is described charerized by a housing, including a central frame having a circular planar web portion from which extend a plurality of annular coaxial ribs which cooperate with similar ribs extending... | 11/02/1976 |
| 3967234 | Depth-of-field arc-transducer and sonar system A large depth-of-field arc-transducer for use in sonar systems is provided in which at least one transducer element is positioned to lie along the arc of a circle of radius R. The active faces of the transducer elements are directed to a point that lies o... | 06/29/1976 |
| 3961291 | Apparatus and method for mapping acoustic fields Apparatus useful for mapping fields in the range of infrasonic to ultraso, comprising a distributed electrostatic transducer, functioning as a strip transmission line, which includes a flat, substantially rectangular, metal plate, one surface of which is... | 06/01/1976 |
