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A gas-turbine engine combustion system has a combustor with a burner head having both pilot gas and pilot liquid-fuel injection arrangements, the pilot gas arrangement comprising an annular gallery communicating with a downstream face of the head and a deflecting arrangement adjacent the gallery for

A gas-turbine engine combustion system has a combustor with a burner head having both pilot gas and pilot liquid-fuel injection arrangements, the pilot gas arrangement comprising an annular gallery communicating with a downstream face of the head and a deflecting arrangement adjacent the gallery for directing the pilot gas-fuel towards a longitudinal axis of the combustor and over a central part of the downstream face. The combustion system is designed so that, during both gas- and liquid-fuel operations, the flame front face is located close to the burner head and, during liquid-fuel operation, air is forced across the downstream face to cool the head. Advantageously, the cooling air is made to replace the pilot gas-fuel in the annular gallery, so that it is deflected, like the gas-fuel, and contacts the central part of the downstream face. The burner head also features main gas and liquid-fuel injection arrangements, these communicating with one or more passageways in a radial swirler attached to the head.

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A gas-turbine engine combustion system has a combustor with a burner head having both pilot gas and pilot liquid-fuel injection arrangements, the pilot gas arrangement comprising an annular gallery communicating with a downstream face of the head and a deflecting arrangement adjacent the gallery for

A gas-turbine engine combustion system has a combustor with a burner head having both pilot gas and pilot liquid-fuel injection arrangements, the pilot gas arrangement comprising an annular gallery communicating with a downstream face of the head and a deflecting arrangement adjacent the gallery for directing the pilot gas-fuel towards a longitudinal axis of the combustor and over a central part of the downstream face. The combustion system is designed so that, during both gas- and liquid-fuel operations, the flame front face is located close to the burner head and, during liquid-fuel operation, air is forced across the downstream face to cool the head. Advantageously, the cooling air is made to replace the pilot gas-fuel in the annular gallery, so that it is deflected, like the gas-fuel, and contacts the central part of the downstream face. The burner head also features main gas and liquid-fuel injection arrangements, these communicating with one or more passageways in a radial swirler attached to the head. , impressing, sandblasting, etching, shaping, polishing, matting, frosting, and diamond cutting. 9. The method as claimed in claim 7, wherein: said regions of different visual properties include regions of different surface textures superimposed on said regions of different colors; and providing a sheet of material includes forming at least one of said regions of different surface textures employing at least one process selected from the group consisting of serrating, scoring, knurling, lining, patterning, pressure stamping, impressing, sandblasting, etching, shaping, polishing, matting, frosting, and diamond cutting. 10. The method as claimed in claim 7, wherein: said regions of different visual properties include regions of different surface textures superimposed on said regions of different reflectivities; and providing a sheet of material includes forming at least one of said regions of different surface textures employing at least one process selected from the group consisting of serrating, scoring, knurling, lining, patterning, pressure stamping, impressing, sandblasting, etching, shaping, polishing, matting, frosting, and diamond cutting. 11. The method as claimed in claim 7, wherein: said regions of different visual properties include regions of different surface textures superimposed on said regions of different materials; and providing a sheet of material includes forming at least one of said regions of different surface textures employing at least one process selected from the group consisting of serrating, scoring, knurling, lining, patterning, pressure stamping, impressing, sandblasting, etching, shaping, polishing, matting, frosting, and diamond cutting. 12. The method as claimed in claim 1, wherein said stamping step comprises stamping said link elements laid out on said sheet of material in pairs, with the gap of one link element of said pair oriented in a direction opposite that of the other link element of the pair, and with one side of each link element of said pair passing through the gap of the other link element of said pair. 13. A jewelry rope chain link element of the type that is assembled with other link elements to form a rope chain, each of said link elements being generally C-shaped in configuration to define a gap between facing ends thereof, said link element comprising: a first major surface; an opposite second major surface; an interior edge; and an exterior edge; said link element constructed of a material having a plurality of regions, adjacent ones of said regions exhibiting different visual properties, thereby defining respective adjacent major surface segments of said link element, each said segment extending from said interior edge to said exterior edge along the extent of said link element, adjacent ones of said segments exhibit different visual properties. 14. The link element as claimed in claim 13, wherein said regions exhibiting different visual properties are parallel elongated regions adjoined along longitudinal straight side edges thereof. 15. The link element as claimed in claim 13, wherein said different visual properties are selected from the group consisting of different colors, different surface textures, different reflectivities, and different materials. 16. The link element as claimed in claim 15, wherein at least one region of the sheet of material from which said link element is manufactured is textured by employing at least one process selected from the group consisting of serrating, scoring, knurling, lining, patterning, pressure stamping, impressing, sandblasting, etching, shaping, polishing, matting, frosting, and diamond cutting, defining differently textured adjacent link element segments. 17. The link element as claimed in claim 16, wherein: said regions of different visual properties include regions of different colors, defining differently colored adjacent link element segments; and one of said differently textured segments is super imposed over one of said differently colored segments. 18. The link element as claimed in claim 16, wherein: said regions of different visual properties include regions of different reflectivities, defining adjacent link element segments of different reflectivity; and one of said differently textured segments is superimposed over one of said segments of different reflectivity. 19. The link element as claimed in claim 16, wherein: said regions of different visual properties include regions of different materials, defining adjacent link element segments of different materials; and one of said differently textured segments is superimposed over one of said segments of different materials. 20. A jewelry rope chain link element of the type that is assembled with other link elements to form a rope chain, each of said link elements being generally C-shaped in configuration to define a gap between facing ends thereof, said link element comprising: a first major surface; an opposite second major surface, one of said major surfaces having a recess formed therein; an interior edge; and an exterior edge; and wherein said link element has a lateral projection formed on said interior edge thereof opposite the position of the gap in the link element. 21. The link element as claimed in claim 20, wherein said lateral projection has two adjacent bumps projecting inwardly from said interior edge. 22. A jewelry rope chain link element of the type that is assembled with other link elements to form a rope chain, each of said link elements being generally C-shaped in configuration to define a gap between facing ends thereof, said link element comprising: a first major surface; an opposite second major surface, one of said major surfaces having a recess formed therein; an interior edge; and an exterior edge; and wherein link width is defined as a distance, measured along either of the major surfaces, between a pair of parallel lines perpendicular to the major surfaces and tangent to, respectively, the interior and exterior edges; and said link element comprises portions adjacent said gap being of relatively larger link width than portions opposite said gap. 23. A jewelry rope chain link element of the type that is assembled with other link elements to form a rope chain, each of said link elements being generally C-shaped in configuration to define a gap between facing ends thereof, said link element comprising: a first major surface; an opposite second major surface, one of said major surfaces having a recess formed therein; an interior edge; and an exterior edge; and wherein said exterior edge has a stepped concave cutout formed therein on at least one of opposite sides of said link element and at a location intermediate said gap and a point on said link element opposite said gap. 24. A jewelry rope chain link element of the type that is assembled with other link elements to form a rope chain, each of said link elements being generally C-shaped in configuration to define a gap between facing ends thereof, said link element comprising: a first major surface; an opposite second major surface, one of said major surfaces having a recess formed therein; an interior edge; and an exterior edge; and wherein said link element has textured depressions on a major surface of said link element, spaced around the exterior periphery thereof. 25. A jewelry rope chain link element of the type that is assembled with other link elements to form a rope chain, each of said link elements being generally C-shaped in configuration to define a gap between facing ends thereof, said link element comprising: a first major surface; an opposite second major surface, one of said major surfaces having a recess formed therein; an interior edge; and an exterior edge; and wherein said link element has notches on said interior edge alternating with notches on said exterior edge along the extent of said link element. 26. A jewelry rope chain link element of the type that is assembled with other link elements to form a rope chain, each of said link elements being generally C-shaped in configuration to define a gap between facing ends thereof, said link element comprising: a first major surface; an opposite second major surface, one of said major surfaces having a recess formed therein; an interior edge; and an exterior edge; and wherein a length of said link element along the extent of said link element comprises a series of connected symbols. 27. The link element as claimed in claim 26, wherein said symbols are heart shapes. 28. The link element as claimed in claim 26, wherein said symbols are geometric shapes. 29. A jewelry rope chain link element of the type that is assembled with other link elements to form a rope chain, each of said link elements being generally C-shaped in configuration to define a gap between facing ends thereof, said link element comprising: a first major surface; an opposite second major surface; an interior edge; and an exterior edge; wherein said link element is manufactured by: providing a sheet of material; and stamping, with a stamping device, a link element from said sheet, the link element so produced departing from the configuration of a conventional annular link element by the formation of a rectangular shaped interior edge and an asymmetrical shaped exterior edge. 30. The link element as claimed in claim 29, wherein: said exterior edge is polygonal; and said interior edge has a patterned cutout on at least one side of said polygonal exterior edge. 31. The link element as claimed in claim 30, wherein one half of said link element has a width greater than the other half thereof. 32. In a length of jewelry rope chain of the type comprising an assembled series of tightly interfitting gapped link elements and having the appearance of two intertwining helical rope strands, the improvement wherein: each of said link elements in said length of rope chain is stamped from a sheet of material comprising a first portion exhibiting a first visual property, and a second portion exhibiting a second, different, visual property; and each of said link elements to be assembled into said series of tightly interfitting gapped link elements comprises a first portion exhibiting said first visual property, and a second portion exhibiting said second, different, visual property; whereby, when viewed from one side of said length of rope chain, the visual appearance of one of said helical rope strands is different than the visual appearance of the other, adjacent, helical rope strand along said length of rope chain; and wherein each of said link elements has a continuous smooth exterior edge surface; said one helical rope strand is of a predetermined effective diameter; and said adjacent helical rope strand is of a different effective diameter than that of said one rope strand. 33. In a length of jewelry rope chain of the type comprising an assembled series of tightly interfitting gapped link elements and having the appearance of two intertwining helical rope strands, the improvement wherein: each of said link elements in said length of rope chain is stamped from a sheet of material comprising a first portion exhibiting a first visual property, and a second portion exhibiting a second, different, visual property; and each of said link elements to be assembled into said series of tightly interfitting gapped link elements comprises a first portion exhibiting said first visual property, and a second portion exhibiting said second, different, visual property; whereby, when viewed from one side of said length of rope chain, the visual appearance of one of said helical rope strands is different than the visual appearance of the other, adjacent, helical rope strand along said length of rope chain; and wherein said visual properties of said two portions are at least one of the group consi