Zarf Zarf A zarf (plural: zarfs, zuruuf, zarves) is a holder, usually of ornamental metal, for a coffee cup without a handle (demitasse or fincan). Although coffee was probably discovered in Ethiopia, it was in Turkey at around the thirteenth century that it became popular as a beverage. As with the serving of tea in China and Japan, the serving of coffee in Turkey was a complex, ritualized process. It was served in small cups without handles (known as "fincan"), which were placed in holders known as "zarf" (from the Arabic word ظرف "ẓarf", meaning "container, envelope") to protect the cup
Flame holder projects, is the can-type flame holder, which consists of a can covered in small holes. Much more effective is the H-gutter flame holder, which is shaped like a letter H with a curve facing and opposing the flow of air. Even more effective, however, is the V-gutter flame holder, which is shaped like a V with the point in the direction facing the flow of air. Some studies have suggested that adding a small amount of base bleed to a V-gutter helps reduce drag without reducing effectiveness. The most effective of the flame holders are the step type flame holder