Abstract: A plurality of optical sensors are mounted to a housing made of optically conductive material. The housing seals the optical sensors from a water-filled tube which extends through said housing. The optically conductive material provides optical coupling with the water-filled cable tube whereby a plurality of light beams are directed through the housing and the water-filled tube in a predetermined pattern, which provides certainty of the absence or presence of a cable within the water-filled cable tube for a minimum cable diameter regardless of the orientation of the cable within the water-filled tube.

Abstract: A plurality of optical sensors are mounted to a housing made of optically conductive material. The housing seals the optical sensors from a water-filled tube which extends through said housing. The optically conductive material provides optical coupling with the water-filled cable tube whereby a plurality of light beams are directed through the housing and the water-filled tube in a predetermined pattern, which provides certainty of the absence or presence of a cable within the water-filled cable tube for a minimum cable diameter regardless of the orientation of the cable within the water-filled tube.

Abstract: A golf putter featuring a planar top with a sighting groove and a void through which a shaft can be affixed to the club head. The shaft is affixed to a core located in the lower rear portion of the club head. The core is separated by additional material located at the heel and toe ends of the club head. The planar top exists above a curved striking surface, and a bottom portion, which is curved along the longitudinal axis of the club head. The club head is designed to maximize alignment capability in the "address" position, impart a top spin on a struck ball and distribute weight to the bottom center of the club head providing a unique combination of geometry, balance and trajectory characteristics.