Focusing nozzle

A focusing nozzle for producing a cohesive focused jet of a mixture of liquid and particulate material, used to make precision cuts in generally hard surfaced materials comprising:

• an elongated tubular body having a first end, a second end, a circular inlet formed at the first end of said body and a non-circular outlet formed at the second end of said body, wherein a cohesive jet of liquid and a quantity of particulate material separately enter the circular inlet;
• a central, longitudinal bore retained within said elongated body and disposed between and in contact with the circular inlet and the non-circular outlet, said longitudinal bore having a first circular bore portion commencing at the circular inlet and extending toward the non-circular outlet, and a second non-circular bore portion commencing at the non-circular outlet and extending toward the circular inlet, wherein the circular bore portion tapers in a narrowing, conical manner in the direction of the non-circular outlet;
• an intersection within said central, longitudinal bore, wherein the first circular bore portion intersects the non-circular bore portion, such that the diameter of the circular bore is a maximum at the circular inlet and a minimum at said intersection;
• and
• a non-circular cohesive focused jet of a mixture of liquid and particulate material, egressing from the non-circular outlet formed at the second end of said elongated body, formed from the cohesive let of liquid and the quantity of particulate material entering the circular inlet.